From 863580418bc82062083be854355f2213d3d804f5 Mon Sep 17 00:00:00 2001 From: Dmitry Baryshkov Date: Wed, 1 Sep 2021 14:43:50 +0300 Subject: [PATCH 01/26] regulator: qcom-rpmh-regulator: fix pm8009-1 ldo7 resource name Fix a typo in the pm8009 LDO7 declaration, it uses resource name ldo%s6 instead of ldo%s7. Fixes: 951384cabc5d ("regulator: qcom-rpmh-regulator: add pm8009-1 chip revision") Signed-off-by: Dmitry Baryshkov Reviewed-by: Bjorn Andersson Link: https://lore.kernel.org/r/20210901114350.1106073-1-dmitry.baryshkov@linaro.org Signed-off-by: Mark Brown --- drivers/regulator/qcom-rpmh-regulator.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/regulator/qcom-rpmh-regulator.c b/drivers/regulator/qcom-rpmh-regulator.c index 6cca910a76de..7f458d510483 100644 --- a/drivers/regulator/qcom-rpmh-regulator.c +++ b/drivers/regulator/qcom-rpmh-regulator.c @@ -991,7 +991,7 @@ static const struct rpmh_vreg_init_data pm8009_1_vreg_data[] = { RPMH_VREG("ldo4", "ldo%s4", &pmic5_nldo, "vdd-l4"), RPMH_VREG("ldo5", "ldo%s5", &pmic5_pldo, "vdd-l5-l6"), RPMH_VREG("ldo6", "ldo%s6", &pmic5_pldo, "vdd-l5-l6"), - RPMH_VREG("ldo7", "ldo%s6", &pmic5_pldo_lv, "vdd-l7"), + RPMH_VREG("ldo7", "ldo%s7", &pmic5_pldo_lv, "vdd-l7"), {} }; From 5457773ef99f25fcc4b238ac76b68e28273250f4 Mon Sep 17 00:00:00 2001 From: Tobias Schramm Date: Fri, 27 Aug 2021 07:03:57 +0200 Subject: [PATCH 02/26] spi: rockchip: handle zero length transfers without timing out Previously zero length transfers submitted to the Rokchip SPI driver would time out in the SPI layer. This happens because the SPI peripheral does not trigger a transfer completion interrupt for zero length transfers. Fix that by completing zero length transfers immediately at start of transfer. Signed-off-by: Tobias Schramm Link: https://lore.kernel.org/r/20210827050357.165409-1-t.schramm@manjaro.org Signed-off-by: Mark Brown --- drivers/spi/spi-rockchip.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c index 540861ca2ba3..553b6b9d0222 100644 --- a/drivers/spi/spi-rockchip.c +++ b/drivers/spi/spi-rockchip.c @@ -600,6 +600,12 @@ static int rockchip_spi_transfer_one( int ret; bool use_dma; + /* Zero length transfers won't trigger an interrupt on completion */ + if (!xfer->len) { + spi_finalize_current_transfer(ctlr); + return 1; + } + WARN_ON(readl_relaxed(rs->regs + ROCKCHIP_SPI_SSIENR) && (readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY)); From 2bab94090b01bc593d8bc25f68df41f198721173 Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Mon, 6 Sep 2021 21:53:58 -0700 Subject: [PATCH 03/26] spi: tegra20-slink: Declare runtime suspend and resume functions conditionally The following build error is seen with CONFIG_PM=n. drivers/spi/spi-tegra20-slink.c:1188:12: error: 'tegra_slink_runtime_suspend' defined but not used drivers/spi/spi-tegra20-slink.c:1200:12: error: 'tegra_slink_runtime_resume' defined but not used Declare the functions only if PM is enabled. While at it, remove the unnecessary forward declarations. Signed-off-by: Guenter Roeck Reviewed-by: Geert Uytterhoeven Acked-by: Thierry Reding Link: https://lore.kernel.org/r/20210907045358.2138282-1-linux@roeck-us.net Signed-off-by: Mark Brown --- drivers/spi/spi-tegra20-slink.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/spi/spi-tegra20-slink.c b/drivers/spi/spi-tegra20-slink.c index ebd27f883033..8ce840c7ecc8 100644 --- a/drivers/spi/spi-tegra20-slink.c +++ b/drivers/spi/spi-tegra20-slink.c @@ -204,9 +204,6 @@ struct tegra_slink_data { struct dma_async_tx_descriptor *tx_dma_desc; }; -static int tegra_slink_runtime_suspend(struct device *dev); -static int tegra_slink_runtime_resume(struct device *dev); - static inline u32 tegra_slink_readl(struct tegra_slink_data *tspi, unsigned long reg) { @@ -1185,6 +1182,7 @@ static int tegra_slink_resume(struct device *dev) } #endif +#ifdef CONFIG_PM static int tegra_slink_runtime_suspend(struct device *dev) { struct spi_master *master = dev_get_drvdata(dev); @@ -1210,6 +1208,7 @@ static int tegra_slink_runtime_resume(struct device *dev) } return 0; } +#endif /* CONFIG_PM */ static const struct dev_pm_ops slink_pm_ops = { SET_RUNTIME_PM_OPS(tegra_slink_runtime_suspend, From 345e1ae0c6ba54f6a4d32154e80cadc2ee2ef1af Mon Sep 17 00:00:00 2001 From: David Howells Date: Fri, 27 Aug 2021 23:22:02 +0100 Subject: [PATCH 04/26] afs: Fix missing put on afs_read objects and missing get on the key therein The afs_read objects created by afs_req_issue_op() get leaked because afs_alloc_read() returns a ref and then afs_fetch_data() gets its own ref which is released when the operation completes, but the initial ref is never released. Fix this by discarding the initial ref at the end of afs_req_issue_op(). This leak also covered another bug whereby a ref isn't got on the key attached to the read record by afs_req_issue_op(). This isn't a problem as long as the afs_read req never goes away... Fix this by calling key_get() in afs_req_issue_op(). This was found by the generic/074 test. It leaks a bunch of kmalloc-192 objects each time it is run, which can be observed by watching /proc/slabinfo. Fixes: f7605fa869cf ("afs: Fix leak of afs_read objects") Reported-by: Marc Dionne Signed-off-by: David Howells Reviewed-and-tested-by: Marc Dionne cc: linux-afs@lists.infradead.org Link: https://lore.kernel.org/r/163010394740.3035676.8516846193899793357.stgit@warthog.procyon.org.uk/ Link: https://lore.kernel.org/r/163111665914.283156.3038561975681836591.stgit@warthog.procyon.org.uk/ --- fs/afs/file.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/afs/file.c b/fs/afs/file.c index db035ae2a134..6688fff14b0b 100644 --- a/fs/afs/file.c +++ b/fs/afs/file.c @@ -295,7 +295,7 @@ static void afs_req_issue_op(struct netfs_read_subrequest *subreq) fsreq->subreq = subreq; fsreq->pos = subreq->start + subreq->transferred; fsreq->len = subreq->len - subreq->transferred; - fsreq->key = subreq->rreq->netfs_priv; + fsreq->key = key_get(subreq->rreq->netfs_priv); fsreq->vnode = vnode; fsreq->iter = &fsreq->def_iter; @@ -304,6 +304,7 @@ static void afs_req_issue_op(struct netfs_read_subrequest *subreq) fsreq->pos, fsreq->len); afs_fetch_data(fsreq->vnode, fsreq); + afs_put_read(fsreq); } static int afs_symlink_readpage(struct page *page) From 581b2027af0018944ba301d68e7af45c6d1128b5 Mon Sep 17 00:00:00 2001 From: David Howells Date: Wed, 1 Sep 2021 09:15:21 +0100 Subject: [PATCH 05/26] afs: Fix page leak There's a loop in afs_extend_writeback() that adds extra pages to a write we want to make to improve the efficiency of the writeback by making it larger. This loop stops, however, if we hit a page we can't write back from immediately, but it doesn't get rid of the page ref we speculatively acquired. This was caused by the removal of the cleanup loop when the code switched from using find_get_pages_contig() to xarray scanning as the latter only gets a single page at a time, not a batch. Fix this by putting the page on a ref on an early break from the loop. Unfortunately, we can't just add that page to the pagevec we're employing as we'll go through that and add those pages to the RPC call. This was found by the generic/074 test. It leaks ~4GiB of RAM each time it is run - which can be observed with "top". Fixes: e87b03f5830e ("afs: Prepare for use of THPs") Reported-by: Marc Dionne Signed-off-by: David Howells Reviewed-and-tested-by: Marc Dionne cc: linux-afs@lists.infradead.org Link: https://lore.kernel.org/r/163111666635.283156.177701903478910460.stgit@warthog.procyon.org.uk/ --- fs/afs/write.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/fs/afs/write.c b/fs/afs/write.c index c0534697268e..66b235266893 100644 --- a/fs/afs/write.c +++ b/fs/afs/write.c @@ -471,13 +471,18 @@ static void afs_extend_writeback(struct address_space *mapping, } /* Has the page moved or been split? */ - if (unlikely(page != xas_reload(&xas))) + if (unlikely(page != xas_reload(&xas))) { + put_page(page); break; + } - if (!trylock_page(page)) + if (!trylock_page(page)) { + put_page(page); break; + } if (!PageDirty(page) || PageWriteback(page)) { unlock_page(page); + put_page(page); break; } @@ -487,6 +492,7 @@ static void afs_extend_writeback(struct address_space *mapping, t = afs_page_dirty_to(page, priv); if (f != 0 && !new_content) { unlock_page(page); + put_page(page); break; } From 3978d816523991dd86cf9aae88c295230a5ea3b2 Mon Sep 17 00:00:00 2001 From: David Howells Date: Wed, 1 Sep 2021 19:22:50 +0100 Subject: [PATCH 06/26] afs: Add missing vnode validation checks afs_d_revalidate() should only be validating the directory entry it is given and the directory to which that belongs; it shouldn't be validating the inode/vnode to which that dentry points. Besides, validation need to be done even if we don't call afs_d_revalidate() - which might be the case if we're starting from a file descriptor. In order for afs_d_revalidate() to be fixed, validation points must be added in some other places. Certain directory operations, such as afs_unlink(), already check this, but not all and not all file operations either. Note that the validation of a vnode not only checks to see if the attributes we have are correct, but also gets a promise from the server to notify us if that file gets changed by a third party. Add the following checks: - Check the vnode we're going to make a hard link to. - Check the vnode we're going to move/rename. - Check the vnode we're going to read from. - Check the vnode we're going to write to. - Check the vnode we're going to sync. - Check the vnode we're going to make a mapped page writable for. Some of these aren't strictly necessary as we're going to perform a server operation that might get the attributes anyway from which we can determine if something changed - though it might not get us a callback promise. Signed-off-by: David Howells Tested-by: Markus Suvanto cc: linux-afs@lists.infradead.org Link: https://lore.kernel.org/r/163111667354.283156.12720698333342917516.stgit@warthog.procyon.org.uk/ --- fs/afs/dir.c | 11 +++++++++++ fs/afs/file.c | 16 +++++++++++++++- fs/afs/write.c | 17 +++++++++++++++-- 3 files changed, 41 insertions(+), 3 deletions(-) diff --git a/fs/afs/dir.c b/fs/afs/dir.c index ac829e63c570..a8e3ae55f1f9 100644 --- a/fs/afs/dir.c +++ b/fs/afs/dir.c @@ -1792,6 +1792,10 @@ static int afs_link(struct dentry *from, struct inode *dir, goto error; } + ret = afs_validate(vnode, op->key); + if (ret < 0) + goto error_op; + afs_op_set_vnode(op, 0, dvnode); afs_op_set_vnode(op, 1, vnode); op->file[0].dv_delta = 1; @@ -1805,6 +1809,8 @@ static int afs_link(struct dentry *from, struct inode *dir, op->create.reason = afs_edit_dir_for_link; return afs_do_sync_operation(op); +error_op: + afs_put_operation(op); error: d_drop(dentry); _leave(" = %d", ret); @@ -1989,6 +1995,11 @@ static int afs_rename(struct user_namespace *mnt_userns, struct inode *old_dir, if (IS_ERR(op)) return PTR_ERR(op); + ret = afs_validate(vnode, op->key); + op->error = ret; + if (ret < 0) + goto error; + afs_op_set_vnode(op, 0, orig_dvnode); afs_op_set_vnode(op, 1, new_dvnode); /* May be same as orig_dvnode */ op->file[0].dv_delta = 1; diff --git a/fs/afs/file.c b/fs/afs/file.c index 6688fff14b0b..4c8d786b53e0 100644 --- a/fs/afs/file.c +++ b/fs/afs/file.c @@ -24,12 +24,13 @@ static void afs_invalidatepage(struct page *page, unsigned int offset, static int afs_releasepage(struct page *page, gfp_t gfp_flags); static void afs_readahead(struct readahead_control *ractl); +static ssize_t afs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter); const struct file_operations afs_file_operations = { .open = afs_open, .release = afs_release, .llseek = generic_file_llseek, - .read_iter = generic_file_read_iter, + .read_iter = afs_file_read_iter, .write_iter = afs_file_write, .mmap = afs_file_mmap, .splice_read = generic_file_splice_read, @@ -503,3 +504,16 @@ static int afs_file_mmap(struct file *file, struct vm_area_struct *vma) vma->vm_ops = &afs_vm_ops; return ret; } + +static ssize_t afs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter) +{ + struct afs_vnode *vnode = AFS_FS_I(file_inode(iocb->ki_filp)); + struct afs_file *af = iocb->ki_filp->private_data; + int ret; + + ret = afs_validate(vnode, af->key); + if (ret < 0) + return ret; + + return generic_file_read_iter(iocb, iter); +} diff --git a/fs/afs/write.c b/fs/afs/write.c index 66b235266893..32a764c24284 100644 --- a/fs/afs/write.c +++ b/fs/afs/write.c @@ -807,6 +807,7 @@ int afs_writepages(struct address_space *mapping, ssize_t afs_file_write(struct kiocb *iocb, struct iov_iter *from) { struct afs_vnode *vnode = AFS_FS_I(file_inode(iocb->ki_filp)); + struct afs_file *af = iocb->ki_filp->private_data; ssize_t result; size_t count = iov_iter_count(from); @@ -822,6 +823,10 @@ ssize_t afs_file_write(struct kiocb *iocb, struct iov_iter *from) if (!count) return 0; + result = afs_validate(vnode, af->key); + if (result < 0) + return result; + result = generic_file_write_iter(iocb, from); _leave(" = %zd", result); @@ -835,13 +840,18 @@ ssize_t afs_file_write(struct kiocb *iocb, struct iov_iter *from) */ int afs_fsync(struct file *file, loff_t start, loff_t end, int datasync) { - struct inode *inode = file_inode(file); - struct afs_vnode *vnode = AFS_FS_I(inode); + struct afs_vnode *vnode = AFS_FS_I(file_inode(file)); + struct afs_file *af = file->private_data; + int ret; _enter("{%llx:%llu},{n=%pD},%d", vnode->fid.vid, vnode->fid.vnode, file, datasync); + ret = afs_validate(vnode, af->key); + if (ret < 0) + return ret; + return file_write_and_wait_range(file, start, end); } @@ -855,11 +865,14 @@ vm_fault_t afs_page_mkwrite(struct vm_fault *vmf) struct file *file = vmf->vma->vm_file; struct inode *inode = file_inode(file); struct afs_vnode *vnode = AFS_FS_I(inode); + struct afs_file *af = file->private_data; unsigned long priv; vm_fault_t ret = VM_FAULT_RETRY; _enter("{{%llx:%llu}},{%lx}", vnode->fid.vid, vnode->fid.vnode, page->index); + afs_validate(vnode, af->key); + sb_start_pagefault(inode->i_sb); /* Wait for the page to be written to the cache before we allow it to From 63d49d843ef5fffeea069e0ffdfbd2bf40ba01c6 Mon Sep 17 00:00:00 2001 From: David Howells Date: Wed, 1 Sep 2021 18:11:33 +0100 Subject: [PATCH 07/26] afs: Fix incorrect triggering of sillyrename on 3rd-party invalidation The AFS filesystem is currently triggering the silly-rename cleanup from afs_d_revalidate() when it sees that a dentry has been changed by a third party[1]. It should not be doing this as the cleanup includes deleting the silly-rename target file on iput. Fix this by removing the places in the d_revalidate handling that validate anything other than the directory and the dirent. It probably should not be looking to validate the target inode of the dentry also. This includes removing the point in afs_d_revalidate() where the inode that a dentry used to point to was marked as being deleted (AFS_VNODE_DELETED). We don't know it got deleted. It could have been renamed or it could have hard links remaining. This was reproduced by cloning a git repo onto an afs volume on one machine, switching to another machine and doing "git status", then switching back to the first and doing "git status". The second status would show weird output due to ".git/index" getting deleted by the above mentioned mechanism. A simpler way to do it is to do: machine 1: touch a machine 2: touch b; mv -f b a machine 1: stat a on an afs volume. The bug shows up as the stat failing with ENOENT and the file server log showing that machine 1 deleted "a". Fixes: 79ddbfa500b3 ("afs: Implement sillyrename for unlink and rename") Reported-by: Markus Suvanto Signed-off-by: David Howells Tested-by: Markus Suvanto cc: linux-afs@lists.infradead.org Link: https://bugzilla.kernel.org/show_bug.cgi?id=214217#c4 [1] Link: https://lore.kernel.org/r/163111668100.283156.3851669884664475428.stgit@warthog.procyon.org.uk/ --- fs/afs/dir.c | 46 +++++++--------------------------------------- 1 file changed, 7 insertions(+), 39 deletions(-) diff --git a/fs/afs/dir.c b/fs/afs/dir.c index a8e3ae55f1f9..4579bbda4634 100644 --- a/fs/afs/dir.c +++ b/fs/afs/dir.c @@ -1077,9 +1077,9 @@ static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, */ static int afs_d_revalidate_rcu(struct dentry *dentry) { - struct afs_vnode *dvnode, *vnode; + struct afs_vnode *dvnode; struct dentry *parent; - struct inode *dir, *inode; + struct inode *dir; long dir_version, de_version; _enter("%p", dentry); @@ -1109,18 +1109,6 @@ static int afs_d_revalidate_rcu(struct dentry *dentry) return -ECHILD; } - /* Check to see if the vnode referred to by the dentry still - * has a callback. - */ - if (d_really_is_positive(dentry)) { - inode = d_inode_rcu(dentry); - if (inode) { - vnode = AFS_FS_I(inode); - if (!afs_check_validity(vnode)) - return -ECHILD; - } - } - return 1; /* Still valid */ } @@ -1156,17 +1144,7 @@ static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) if (IS_ERR(key)) key = NULL; - if (d_really_is_positive(dentry)) { - inode = d_inode(dentry); - if (inode) { - vnode = AFS_FS_I(inode); - afs_validate(vnode, key); - if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) - goto out_bad; - } - } - - /* lock down the parent dentry so we can peer at it */ + /* Hold the parent dentry so we can peer at it */ parent = dget_parent(dentry); dir = AFS_FS_I(d_inode(parent)); @@ -1175,7 +1153,7 @@ static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { _debug("%pd: parent dir deleted", dentry); - goto out_bad_parent; + goto not_found; } /* We only need to invalidate a dentry if the server's copy changed @@ -1201,12 +1179,12 @@ static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) case 0: /* the filename maps to something */ if (d_really_is_negative(dentry)) - goto out_bad_parent; + goto not_found; inode = d_inode(dentry); if (is_bad_inode(inode)) { printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", dentry); - goto out_bad_parent; + goto not_found; } vnode = AFS_FS_I(inode); @@ -1228,9 +1206,6 @@ static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) dentry, fid.unique, vnode->fid.unique, vnode->vfs_inode.i_generation); - write_seqlock(&vnode->cb_lock); - set_bit(AFS_VNODE_DELETED, &vnode->flags); - write_sequnlock(&vnode->cb_lock); goto not_found; } goto out_valid; @@ -1245,7 +1220,7 @@ static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) default: _debug("failed to iterate dir %pd: %d", parent, ret); - goto out_bad_parent; + goto not_found; } out_valid: @@ -1256,16 +1231,9 @@ out_valid_noupdate: _leave(" = 1 [valid]"); return 1; - /* the dirent, if it exists, now points to a different vnode */ not_found: - spin_lock(&dentry->d_lock); - dentry->d_flags |= DCACHE_NFSFS_RENAMED; - spin_unlock(&dentry->d_lock); - -out_bad_parent: _debug("dropping dentry %pd2", dentry); dput(parent); -out_bad: key_put(key); _leave(" = 0 [bad]"); From 6e0e99d58a6530cf65f10e4bb16630c5be6c254d Mon Sep 17 00:00:00 2001 From: David Howells Date: Thu, 2 Sep 2021 16:43:10 +0100 Subject: [PATCH 08/26] afs: Fix mmap coherency vs 3rd-party changes Fix the coherency management of mmap'd data such that 3rd-party changes become visible as soon as possible after the callback notification is delivered by the fileserver. This is done by the following means: (1) When we break a callback on a vnode specified by the CB.CallBack call from the server, we queue a work item (vnode->cb_work) to go and clobber all the PTEs mapping to that inode. This causes the CPU to trip through the ->map_pages() and ->page_mkwrite() handlers if userspace attempts to access the page(s) again. (Ideally, this would be done in the service handler for CB.CallBack, but the server is waiting for our reply before considering, and we have a list of vnodes, all of which need breaking - and the process of getting the mmap_lock and stripping the PTEs on all CPUs could be quite slow.) (2) Call afs_validate() from the ->map_pages() handler to check to see if the file has changed and to get a new callback promise from the server. Also handle the fileserver telling us that it's dropping all callbacks, possibly after it's been restarted by sending us a CB.InitCallBackState* call by the following means: (3) Maintain a per-cell list of afs files that are currently mmap'd (cell->fs_open_mmaps). (4) Add a work item to each server that is invoked if there are any open mmaps when CB.InitCallBackState happens. This work item goes through the aforementioned list and invokes the vnode->cb_work work item for each one that is currently using this server. This causes the PTEs to be cleared, causing ->map_pages() or ->page_mkwrite() to be called again, thereby calling afs_validate() again. I've chosen to simply strip the PTEs at the point of notification reception rather than invalidate all the pages as well because (a) it's faster, (b) we may get a notification for other reasons than the data being altered (in which case we don't want to clobber the pagecache) and (c) we need to ask the server to find out - and I don't want to wait for the reply before holding up userspace. This was tested using the attached test program: #include #include #include #include #include #include int main(int argc, char *argv[]) { size_t size = getpagesize(); unsigned char *p; bool mod = (argc == 3); int fd; if (argc != 2 && argc != 3) { fprintf(stderr, "Format: %s [mod]\n", argv[0]); exit(2); } fd = open(argv[1], mod ? O_RDWR : O_RDONLY); if (fd < 0) { perror(argv[1]); exit(1); } p = mmap(NULL, size, mod ? PROT_READ|PROT_WRITE : PROT_READ, MAP_SHARED, fd, 0); if (p == MAP_FAILED) { perror("mmap"); exit(1); } for (;;) { if (mod) { p[0]++; msync(p, size, MS_ASYNC); fsync(fd); } printf("%02x", p[0]); fflush(stdout); sleep(1); } } It runs in two modes: in one mode, it mmaps a file, then sits in a loop reading the first byte, printing it and sleeping for a second; in the second mode it mmaps a file, then sits in a loop incrementing the first byte and flushing, then printing and sleeping. Two instances of this program can be run on different machines, one doing the reading and one doing the writing. The reader should see the changes made by the writer, but without this patch, they aren't because validity checking is being done lazily - only on entry to the filesystem. Testing the InitCallBackState change is more complicated. The server has to be taken offline, the saved callback state file removed and then the server restarted whilst the reading-mode program continues to run. The client machine then has to poke the server to trigger the InitCallBackState call. Signed-off-by: David Howells Tested-by: Markus Suvanto cc: linux-afs@lists.infradead.org Link: https://lore.kernel.org/r/163111668833.283156.382633263709075739.stgit@warthog.procyon.org.uk/ --- fs/afs/callback.c | 42 +++++++++++++++++++++++++++-- fs/afs/cell.c | 2 ++ fs/afs/file.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++- fs/afs/internal.h | 8 ++++++ fs/afs/server.c | 2 ++ fs/afs/super.c | 1 + mm/memory.c | 1 + 7 files changed, 120 insertions(+), 3 deletions(-) diff --git a/fs/afs/callback.c b/fs/afs/callback.c index 7d9b23d981bf..1dd7543dbf9f 100644 --- a/fs/afs/callback.c +++ b/fs/afs/callback.c @@ -20,6 +20,37 @@ #include #include "internal.h" +/* + * Handle invalidation of an mmap'd file. We invalidate all the PTEs referring + * to the pages in this file's pagecache, forcing the kernel to go through + * ->fault() or ->page_mkwrite() - at which point we can handle invalidation + * more fully. + */ +void afs_invalidate_mmap_work(struct work_struct *work) +{ + struct afs_vnode *vnode = container_of(work, struct afs_vnode, cb_work); + + unmap_mapping_pages(vnode->vfs_inode.i_mapping, 0, 0, false); +} + +void afs_server_init_callback_work(struct work_struct *work) +{ + struct afs_server *server = container_of(work, struct afs_server, initcb_work); + struct afs_vnode *vnode; + struct afs_cell *cell = server->cell; + + down_read(&cell->fs_open_mmaps_lock); + + list_for_each_entry(vnode, &cell->fs_open_mmaps, cb_mmap_link) { + if (vnode->cb_server == server) { + clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); + queue_work(system_unbound_wq, &vnode->cb_work); + } + } + + up_read(&cell->fs_open_mmaps_lock); +} + /* * Allow the fileserver to request callback state (re-)initialisation. * Unfortunately, UUIDs are not guaranteed unique. @@ -29,8 +60,10 @@ void afs_init_callback_state(struct afs_server *server) rcu_read_lock(); do { server->cb_s_break++; - server = rcu_dereference(server->uuid_next); - } while (0); + if (!list_empty(&server->cell->fs_open_mmaps)) + queue_work(system_unbound_wq, &server->initcb_work); + + } while ((server = rcu_dereference(server->uuid_next))); rcu_read_unlock(); } @@ -49,6 +82,11 @@ void __afs_break_callback(struct afs_vnode *vnode, enum afs_cb_break_reason reas if (vnode->lock_state == AFS_VNODE_LOCK_WAITING_FOR_CB) afs_lock_may_be_available(vnode); + if (reason != afs_cb_break_for_deleted && + vnode->status.type == AFS_FTYPE_FILE && + atomic_read(&vnode->cb_nr_mmap)) + queue_work(system_unbound_wq, &vnode->cb_work); + trace_afs_cb_break(&vnode->fid, vnode->cb_break, reason, true); } else { trace_afs_cb_break(&vnode->fid, vnode->cb_break, reason, false); diff --git a/fs/afs/cell.c b/fs/afs/cell.c index 887b673f6223..d88407fb9bc0 100644 --- a/fs/afs/cell.c +++ b/fs/afs/cell.c @@ -166,6 +166,8 @@ static struct afs_cell *afs_alloc_cell(struct afs_net *net, seqlock_init(&cell->volume_lock); cell->fs_servers = RB_ROOT; seqlock_init(&cell->fs_lock); + INIT_LIST_HEAD(&cell->fs_open_mmaps); + init_rwsem(&cell->fs_open_mmaps_lock); rwlock_init(&cell->vl_servers_lock); cell->flags = (1 << AFS_CELL_FL_CHECK_ALIAS); diff --git a/fs/afs/file.c b/fs/afs/file.c index 4c8d786b53e0..e6c447ae91f3 100644 --- a/fs/afs/file.c +++ b/fs/afs/file.c @@ -25,6 +25,9 @@ static int afs_releasepage(struct page *page, gfp_t gfp_flags); static void afs_readahead(struct readahead_control *ractl); static ssize_t afs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter); +static void afs_vm_open(struct vm_area_struct *area); +static void afs_vm_close(struct vm_area_struct *area); +static vm_fault_t afs_vm_map_pages(struct vm_fault *vmf, pgoff_t start_pgoff, pgoff_t end_pgoff); const struct file_operations afs_file_operations = { .open = afs_open, @@ -60,8 +63,10 @@ const struct address_space_operations afs_fs_aops = { }; static const struct vm_operations_struct afs_vm_ops = { + .open = afs_vm_open, + .close = afs_vm_close, .fault = filemap_fault, - .map_pages = filemap_map_pages, + .map_pages = afs_vm_map_pages, .page_mkwrite = afs_page_mkwrite, }; @@ -492,19 +497,79 @@ static int afs_releasepage(struct page *page, gfp_t gfp_flags) return 1; } +static void afs_add_open_mmap(struct afs_vnode *vnode) +{ + if (atomic_inc_return(&vnode->cb_nr_mmap) == 1) { + down_write(&vnode->volume->cell->fs_open_mmaps_lock); + + list_add_tail(&vnode->cb_mmap_link, + &vnode->volume->cell->fs_open_mmaps); + + up_write(&vnode->volume->cell->fs_open_mmaps_lock); + } +} + +static void afs_drop_open_mmap(struct afs_vnode *vnode) +{ + if (!atomic_dec_and_test(&vnode->cb_nr_mmap)) + return; + + down_write(&vnode->volume->cell->fs_open_mmaps_lock); + + if (atomic_read(&vnode->cb_nr_mmap) == 0) + list_del_init(&vnode->cb_mmap_link); + + up_write(&vnode->volume->cell->fs_open_mmaps_lock); + flush_work(&vnode->cb_work); +} + /* * Handle setting up a memory mapping on an AFS file. */ static int afs_file_mmap(struct file *file, struct vm_area_struct *vma) { + struct afs_vnode *vnode = AFS_FS_I(file_inode(file)); int ret; + afs_add_open_mmap(vnode); + ret = generic_file_mmap(file, vma); if (ret == 0) vma->vm_ops = &afs_vm_ops; + else + afs_drop_open_mmap(vnode); return ret; } +static void afs_vm_open(struct vm_area_struct *vma) +{ + afs_add_open_mmap(AFS_FS_I(file_inode(vma->vm_file))); +} + +static void afs_vm_close(struct vm_area_struct *vma) +{ + afs_drop_open_mmap(AFS_FS_I(file_inode(vma->vm_file))); +} + +static vm_fault_t afs_vm_map_pages(struct vm_fault *vmf, pgoff_t start_pgoff, pgoff_t end_pgoff) +{ + struct afs_vnode *vnode = AFS_FS_I(file_inode(vmf->vma->vm_file)); + struct afs_file *af = vmf->vma->vm_file->private_data; + + switch (afs_validate(vnode, af->key)) { + case 0: + return filemap_map_pages(vmf, start_pgoff, end_pgoff); + case -ENOMEM: + return VM_FAULT_OOM; + case -EINTR: + case -ERESTARTSYS: + return VM_FAULT_RETRY; + case -ESTALE: + default: + return VM_FAULT_SIGBUS; + } +} + static ssize_t afs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter) { struct afs_vnode *vnode = AFS_FS_I(file_inode(iocb->ki_filp)); diff --git a/fs/afs/internal.h b/fs/afs/internal.h index 5ed416f4ff33..0deeb76c67d0 100644 --- a/fs/afs/internal.h +++ b/fs/afs/internal.h @@ -390,6 +390,8 @@ struct afs_cell { /* Active fileserver interaction state. */ struct rb_root fs_servers; /* afs_server (by server UUID) */ seqlock_t fs_lock; /* For fs_servers */ + struct rw_semaphore fs_open_mmaps_lock; + struct list_head fs_open_mmaps; /* List of vnodes that are mmapped */ /* VL server list. */ rwlock_t vl_servers_lock; /* Lock on vl_servers */ @@ -503,6 +505,7 @@ struct afs_server { struct hlist_node addr4_link; /* Link in net->fs_addresses4 */ struct hlist_node addr6_link; /* Link in net->fs_addresses6 */ struct hlist_node proc_link; /* Link in net->fs_proc */ + struct work_struct initcb_work; /* Work for CB.InitCallBackState* */ struct afs_server *gc_next; /* Next server in manager's list */ time64_t unuse_time; /* Time at which last unused */ unsigned long flags; @@ -657,7 +660,10 @@ struct afs_vnode { afs_lock_type_t lock_type : 8; /* outstanding callback notification on this file */ + struct work_struct cb_work; /* Work for mmap'd files */ + struct list_head cb_mmap_link; /* Link in cell->fs_open_mmaps */ void *cb_server; /* Server with callback/filelock */ + atomic_t cb_nr_mmap; /* Number of mmaps */ unsigned int cb_s_break; /* Mass break counter on ->server */ unsigned int cb_v_break; /* Mass break counter on ->volume */ unsigned int cb_break; /* Break counter on vnode */ @@ -965,6 +971,8 @@ extern struct fscache_cookie_def afs_vnode_cache_index_def; /* * callback.c */ +extern void afs_invalidate_mmap_work(struct work_struct *); +extern void afs_server_init_callback_work(struct work_struct *work); extern void afs_init_callback_state(struct afs_server *); extern void __afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason); extern void afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason); diff --git a/fs/afs/server.c b/fs/afs/server.c index 684a2b02b9ff..6e5b9a19b234 100644 --- a/fs/afs/server.c +++ b/fs/afs/server.c @@ -235,6 +235,7 @@ static struct afs_server *afs_alloc_server(struct afs_cell *cell, server->addr_version = alist->version; server->uuid = *uuid; rwlock_init(&server->fs_lock); + INIT_WORK(&server->initcb_work, afs_server_init_callback_work); init_waitqueue_head(&server->probe_wq); INIT_LIST_HEAD(&server->probe_link); spin_lock_init(&server->probe_lock); @@ -467,6 +468,7 @@ static void afs_destroy_server(struct afs_net *net, struct afs_server *server) if (test_bit(AFS_SERVER_FL_MAY_HAVE_CB, &server->flags)) afs_give_up_callbacks(net, server); + flush_work(&server->initcb_work); afs_put_server(net, server, afs_server_trace_destroy); } diff --git a/fs/afs/super.c b/fs/afs/super.c index e38bb1e7a4d2..d110def8aa8e 100644 --- a/fs/afs/super.c +++ b/fs/afs/super.c @@ -698,6 +698,7 @@ static struct inode *afs_alloc_inode(struct super_block *sb) vnode->lock_state = AFS_VNODE_LOCK_NONE; init_rwsem(&vnode->rmdir_lock); + INIT_WORK(&vnode->cb_work, afs_invalidate_mmap_work); _leave(" = %p", &vnode->vfs_inode); return &vnode->vfs_inode; diff --git a/mm/memory.c b/mm/memory.c index 25fc46e87214..adf9b9ef8277 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3403,6 +3403,7 @@ void unmap_mapping_pages(struct address_space *mapping, pgoff_t start, unmap_mapping_range_tree(&mapping->i_mmap, &details); i_mmap_unlock_write(mapping); } +EXPORT_SYMBOL_GPL(unmap_mapping_pages); /** * unmap_mapping_range - unmap the portion of all mmaps in the specified From 4fe6a946823a9bc8619fd16b7ea7d15914a30f22 Mon Sep 17 00:00:00 2001 From: David Howells Date: Thu, 2 Sep 2021 21:51:01 +0100 Subject: [PATCH 09/26] afs: Try to avoid taking RCU read lock when checking vnode validity Try to avoid taking the RCU read lock when checking the validity of a vnode's callback state. The only thing it's needed for is to pin the parent volume's server list whilst we search it to find the record of the server we're currently using to see if it has been reinitialised (ie. it sent us a CB.InitCallBackState* RPC). Do this by the following means: (1) Keep an additional per-cell counter (fs_s_break) that's incremented each time any of the fileservers in the cell reinitialises. Since the new counter can be accessed without RCU from the vnode, we can check that first - and only if it differs, get the RCU read lock and check the volume's server list. (2) Replace afs_get_s_break_rcu() with afs_check_server_good() which now indicates whether the callback promise is still expected to be present on the server. This does the checks as described in (1). (3) Restructure afs_check_validity() to take account of the change in (2). We can also get rid of the valid variable and just use the need_clear variable with the addition of the afs_cb_break_no_promise reason. (4) afs_check_validity() probably shouldn't be altering vnode->cb_v_break and vnode->cb_s_break when it doesn't have cb_lock exclusively locked. Move the change to vnode->cb_v_break to __afs_break_callback(). Delegate the change to vnode->cb_s_break to afs_select_fileserver() and set vnode->cb_fs_s_break there also. (5) afs_validate() no longer needs to get the RCU read lock around its call to afs_check_validity() - and can skip the call entirely if we don't have a promise. Signed-off-by: David Howells Tested-by: Markus Suvanto cc: linux-afs@lists.infradead.org Link: https://lore.kernel.org/r/163111669583.283156.1397603105683094563.stgit@warthog.procyon.org.uk/ --- fs/afs/callback.c | 2 + fs/afs/inode.c | 88 +++++++++++++++++++------------------- fs/afs/internal.h | 2 + fs/afs/rotate.c | 1 + include/trace/events/afs.h | 8 +++- 5 files changed, 54 insertions(+), 47 deletions(-) diff --git a/fs/afs/callback.c b/fs/afs/callback.c index 1dd7543dbf9f..1b4d5809808d 100644 --- a/fs/afs/callback.c +++ b/fs/afs/callback.c @@ -60,6 +60,7 @@ void afs_init_callback_state(struct afs_server *server) rcu_read_lock(); do { server->cb_s_break++; + atomic_inc(&server->cell->fs_s_break); if (!list_empty(&server->cell->fs_open_mmaps)) queue_work(system_unbound_wq, &server->initcb_work); @@ -77,6 +78,7 @@ void __afs_break_callback(struct afs_vnode *vnode, enum afs_cb_break_reason reas clear_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags); if (test_and_clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) { vnode->cb_break++; + vnode->cb_v_break = vnode->volume->cb_v_break; afs_clear_permits(vnode); if (vnode->lock_state == AFS_VNODE_LOCK_WAITING_FOR_CB) diff --git a/fs/afs/inode.c b/fs/afs/inode.c index 80b6c8d967d5..126daf9969db 100644 --- a/fs/afs/inode.c +++ b/fs/afs/inode.c @@ -587,22 +587,32 @@ static void afs_zap_data(struct afs_vnode *vnode) } /* - * Get the server reinit counter for a vnode's current server. + * Check to see if we have a server currently serving this volume and that it + * hasn't been reinitialised or dropped from the list. */ -static bool afs_get_s_break_rcu(struct afs_vnode *vnode, unsigned int *_s_break) +static bool afs_check_server_good(struct afs_vnode *vnode) { - struct afs_server_list *slist = rcu_dereference(vnode->volume->servers); + struct afs_server_list *slist; struct afs_server *server; + bool good; int i; + if (vnode->cb_fs_s_break == atomic_read(&vnode->volume->cell->fs_s_break)) + return true; + + rcu_read_lock(); + + slist = rcu_dereference(vnode->volume->servers); for (i = 0; i < slist->nr_servers; i++) { server = slist->servers[i].server; if (server == vnode->cb_server) { - *_s_break = READ_ONCE(server->cb_s_break); - return true; + good = (vnode->cb_s_break == server->cb_s_break); + rcu_read_unlock(); + return good; } } + rcu_read_unlock(); return false; } @@ -611,57 +621,46 @@ static bool afs_get_s_break_rcu(struct afs_vnode *vnode, unsigned int *_s_break) */ bool afs_check_validity(struct afs_vnode *vnode) { - struct afs_volume *volume = vnode->volume; enum afs_cb_break_reason need_clear = afs_cb_break_no_break; time64_t now = ktime_get_real_seconds(); - bool valid; - unsigned int cb_break, cb_s_break, cb_v_break; + unsigned int cb_break; int seq = 0; do { read_seqbegin_or_lock(&vnode->cb_lock, &seq); - cb_v_break = READ_ONCE(volume->cb_v_break); cb_break = vnode->cb_break; - if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags) && - afs_get_s_break_rcu(vnode, &cb_s_break)) { - if (vnode->cb_s_break != cb_s_break || - vnode->cb_v_break != cb_v_break) { - vnode->cb_s_break = cb_s_break; - vnode->cb_v_break = cb_v_break; - need_clear = afs_cb_break_for_vsbreak; - valid = false; - } else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) { + if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) { + if (vnode->cb_v_break != vnode->volume->cb_v_break) + need_clear = afs_cb_break_for_v_break; + else if (!afs_check_server_good(vnode)) + need_clear = afs_cb_break_for_s_reinit; + else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) need_clear = afs_cb_break_for_zap; - valid = false; - } else if (vnode->cb_expires_at - 10 <= now) { + else if (vnode->cb_expires_at - 10 <= now) need_clear = afs_cb_break_for_lapsed; - valid = false; - } else { - valid = true; - } } else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { - valid = true; + ; } else { - vnode->cb_v_break = cb_v_break; - valid = false; + need_clear = afs_cb_break_no_promise; } } while (need_seqretry(&vnode->cb_lock, seq)); done_seqretry(&vnode->cb_lock, seq); - if (need_clear != afs_cb_break_no_break) { - write_seqlock(&vnode->cb_lock); - if (cb_break == vnode->cb_break) - __afs_break_callback(vnode, need_clear); - else - trace_afs_cb_miss(&vnode->fid, need_clear); - write_sequnlock(&vnode->cb_lock); - valid = false; - } + if (need_clear == afs_cb_break_no_break) + return true; - return valid; + write_seqlock(&vnode->cb_lock); + if (need_clear == afs_cb_break_no_promise) + vnode->cb_v_break = vnode->volume->cb_v_break; + else if (cb_break == vnode->cb_break) + __afs_break_callback(vnode, need_clear); + else + trace_afs_cb_miss(&vnode->fid, need_clear); + write_sequnlock(&vnode->cb_lock); + return false; } /* @@ -675,21 +674,20 @@ bool afs_check_validity(struct afs_vnode *vnode) */ int afs_validate(struct afs_vnode *vnode, struct key *key) { - bool valid; int ret; _enter("{v={%llx:%llu} fl=%lx},%x", vnode->fid.vid, vnode->fid.vnode, vnode->flags, key_serial(key)); - rcu_read_lock(); - valid = afs_check_validity(vnode); - rcu_read_unlock(); + if (unlikely(test_bit(AFS_VNODE_DELETED, &vnode->flags))) { + if (vnode->vfs_inode.i_nlink) + clear_nlink(&vnode->vfs_inode); + goto valid; + } - if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) - clear_nlink(&vnode->vfs_inode); - - if (valid) + if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags) && + afs_check_validity(vnode)) goto valid; down_write(&vnode->validate_lock); diff --git a/fs/afs/internal.h b/fs/afs/internal.h index 0deeb76c67d0..c97618855b46 100644 --- a/fs/afs/internal.h +++ b/fs/afs/internal.h @@ -392,6 +392,7 @@ struct afs_cell { seqlock_t fs_lock; /* For fs_servers */ struct rw_semaphore fs_open_mmaps_lock; struct list_head fs_open_mmaps; /* List of vnodes that are mmapped */ + atomic_t fs_s_break; /* Counter of CB.InitCallBackState messages */ /* VL server list. */ rwlock_t vl_servers_lock; /* Lock on vl_servers */ @@ -664,6 +665,7 @@ struct afs_vnode { struct list_head cb_mmap_link; /* Link in cell->fs_open_mmaps */ void *cb_server; /* Server with callback/filelock */ atomic_t cb_nr_mmap; /* Number of mmaps */ + unsigned int cb_fs_s_break; /* Mass server break counter (cell->fs_s_break) */ unsigned int cb_s_break; /* Mass break counter on ->server */ unsigned int cb_v_break; /* Mass break counter on ->volume */ unsigned int cb_break; /* Break counter on vnode */ diff --git a/fs/afs/rotate.c b/fs/afs/rotate.c index d83f13c44b92..79e1a5f6701b 100644 --- a/fs/afs/rotate.c +++ b/fs/afs/rotate.c @@ -374,6 +374,7 @@ selected_server: if (vnode->cb_server != server) { vnode->cb_server = server; vnode->cb_s_break = server->cb_s_break; + vnode->cb_fs_s_break = atomic_read(&server->cell->fs_s_break); vnode->cb_v_break = vnode->volume->cb_v_break; clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); } diff --git a/include/trace/events/afs.h b/include/trace/events/afs.h index 9f73ed2cf061..bca73e8c8cde 100644 --- a/include/trace/events/afs.h +++ b/include/trace/events/afs.h @@ -306,11 +306,13 @@ enum afs_flock_operation { enum afs_cb_break_reason { afs_cb_break_no_break, + afs_cb_break_no_promise, afs_cb_break_for_callback, afs_cb_break_for_deleted, afs_cb_break_for_lapsed, + afs_cb_break_for_s_reinit, afs_cb_break_for_unlink, - afs_cb_break_for_vsbreak, + afs_cb_break_for_v_break, afs_cb_break_for_volume_callback, afs_cb_break_for_zap, }; @@ -602,11 +604,13 @@ enum afs_cb_break_reason { #define afs_cb_break_reasons \ EM(afs_cb_break_no_break, "no-break") \ + EM(afs_cb_break_no_promise, "no-promise") \ EM(afs_cb_break_for_callback, "break-cb") \ EM(afs_cb_break_for_deleted, "break-del") \ EM(afs_cb_break_for_lapsed, "break-lapsed") \ + EM(afs_cb_break_for_s_reinit, "s-reinit") \ EM(afs_cb_break_for_unlink, "break-unlink") \ - EM(afs_cb_break_for_vsbreak, "break-vs") \ + EM(afs_cb_break_for_v_break, "break-v") \ EM(afs_cb_break_for_volume_callback, "break-v-cb") \ E_(afs_cb_break_for_zap, "break-zap") From b537a3c21775075395af475dcc6ef212fcf29db8 Mon Sep 17 00:00:00 2001 From: David Howells Date: Fri, 10 Sep 2021 00:01:52 +0100 Subject: [PATCH 10/26] afs: Fix corruption in reads at fpos 2G-4G from an OpenAFS server AFS-3 has two data fetch RPC variants, FS.FetchData and FS.FetchData64, and Linux's afs client switches between them when talking to a non-YFS server if the read size, the file position or the sum of the two have the upper 32 bits set of the 64-bit value. This is a problem, however, since the file position and length fields of FS.FetchData are *signed* 32-bit values. Fix this by capturing the capability bits obtained from the fileserver when it's sent an FS.GetCapabilities RPC, rather than just discarding them, and then picking out the VICED_CAPABILITY_64BITFILES flag. This can then be used to decide whether to use FS.FetchData or FS.FetchData64 - and also FS.StoreData or FS.StoreData64 - rather than using upper_32_bits() to switch on the parameter values. This capabilities flag could also be used to limit the maximum size of the file, but all servers must be checked for that. Note that the issue does not exist with FS.StoreData - that uses *unsigned* 32-bit values. It's also not a problem with Auristor servers as its YFS.FetchData64 op uses unsigned 64-bit values. This can be tested by cloning a git repo through an OpenAFS client to an OpenAFS server and then doing "git status" on it from a Linux afs client[1]. Provided the clone has a pack file that's in the 2G-4G range, the git status will show errors like: error: packfile .git/objects/pack/pack-5e813c51d12b6847bbc0fcd97c2bca66da50079c.pack does not match index error: packfile .git/objects/pack/pack-5e813c51d12b6847bbc0fcd97c2bca66da50079c.pack does not match index This can be observed in the server's FileLog with something like the following appearing: Sun Aug 29 19:31:39 2021 SRXAFS_FetchData, Fid = 2303380852.491776.3263114, Host 192.168.11.201:7001, Id 1001 Sun Aug 29 19:31:39 2021 CheckRights: len=0, for host=192.168.11.201:7001 Sun Aug 29 19:31:39 2021 FetchData_RXStyle: Pos 18446744071815340032, Len 3154 Sun Aug 29 19:31:39 2021 FetchData_RXStyle: file size 2400758866 ... Sun Aug 29 19:31:40 2021 SRXAFS_FetchData returns 5 Note the file position of 18446744071815340032. This is the requested file position sign-extended. Fixes: b9b1f8d5930a ("AFS: write support fixes") Reported-by: Markus Suvanto Signed-off-by: David Howells Reviewed-by: Marc Dionne Tested-by: Markus Suvanto cc: linux-afs@lists.infradead.org cc: openafs-devel@openafs.org Link: https://bugzilla.kernel.org/show_bug.cgi?id=214217#c9 [1] Link: https://lore.kernel.org/r/951332.1631308745@warthog.procyon.org.uk/ --- fs/afs/fs_probe.c | 8 +++++++- fs/afs/fsclient.c | 31 ++++++++++++++++++++----------- fs/afs/internal.h | 1 + fs/afs/protocol_afs.h | 15 +++++++++++++++ fs/afs/protocol_yfs.h | 6 ++++++ 5 files changed, 49 insertions(+), 12 deletions(-) create mode 100644 fs/afs/protocol_afs.h diff --git a/fs/afs/fs_probe.c b/fs/afs/fs_probe.c index e7e98ad63a91..c0031a3ab42f 100644 --- a/fs/afs/fs_probe.c +++ b/fs/afs/fs_probe.c @@ -9,6 +9,7 @@ #include #include "afs_fs.h" #include "internal.h" +#include "protocol_afs.h" #include "protocol_yfs.h" static unsigned int afs_fs_probe_fast_poll_interval = 30 * HZ; @@ -102,7 +103,7 @@ void afs_fileserver_probe_result(struct afs_call *call) struct afs_addr_list *alist = call->alist; struct afs_server *server = call->server; unsigned int index = call->addr_ix; - unsigned int rtt_us = 0; + unsigned int rtt_us = 0, cap0; int ret = call->error; _enter("%pU,%u", &server->uuid, index); @@ -159,6 +160,11 @@ responded: clear_bit(AFS_SERVER_FL_IS_YFS, &server->flags); alist->addrs[index].srx_service = call->service_id; } + cap0 = ntohl(call->tmp); + if (cap0 & AFS3_VICED_CAPABILITY_64BITFILES) + set_bit(AFS_SERVER_FL_HAS_FS64, &server->flags); + else + clear_bit(AFS_SERVER_FL_HAS_FS64, &server->flags); } if (rxrpc_kernel_get_srtt(call->net->socket, call->rxcall, &rtt_us) && diff --git a/fs/afs/fsclient.c b/fs/afs/fsclient.c index dd3f45d906d2..4943413d9c5f 100644 --- a/fs/afs/fsclient.c +++ b/fs/afs/fsclient.c @@ -456,9 +456,7 @@ void afs_fs_fetch_data(struct afs_operation *op) struct afs_read *req = op->fetch.req; __be32 *bp; - if (upper_32_bits(req->pos) || - upper_32_bits(req->len) || - upper_32_bits(req->pos + req->len)) + if (test_bit(AFS_SERVER_FL_HAS_FS64, &op->server->flags)) return afs_fs_fetch_data64(op); _enter(""); @@ -1113,9 +1111,7 @@ void afs_fs_store_data(struct afs_operation *op) (unsigned long long)op->store.pos, (unsigned long long)op->store.i_size); - if (upper_32_bits(op->store.pos) || - upper_32_bits(op->store.size) || - upper_32_bits(op->store.i_size)) + if (test_bit(AFS_SERVER_FL_HAS_FS64, &op->server->flags)) return afs_fs_store_data64(op); call = afs_alloc_flat_call(op->net, &afs_RXFSStoreData, @@ -1229,7 +1225,7 @@ static void afs_fs_setattr_size(struct afs_operation *op) key_serial(op->key), vp->fid.vid, vp->fid.vnode); ASSERT(attr->ia_valid & ATTR_SIZE); - if (upper_32_bits(attr->ia_size)) + if (test_bit(AFS_SERVER_FL_HAS_FS64, &op->server->flags)) return afs_fs_setattr_size64(op); call = afs_alloc_flat_call(op->net, &afs_RXFSStoreData_as_Status, @@ -1657,20 +1653,33 @@ static int afs_deliver_fs_get_capabilities(struct afs_call *call) return ret; count = ntohl(call->tmp); - call->count = count; call->count2 = count; - afs_extract_discard(call, count * sizeof(__be32)); + if (count == 0) { + call->unmarshall = 4; + call->tmp = 0; + break; + } + + /* Extract the first word of the capabilities to call->tmp */ + afs_extract_to_tmp(call); call->unmarshall++; fallthrough; - /* Extract capabilities words */ case 2: ret = afs_extract_data(call, false); if (ret < 0) return ret; - /* TODO: Examine capabilities */ + afs_extract_discard(call, (count - 1) * sizeof(__be32)); + call->unmarshall++; + fallthrough; + + /* Extract remaining capabilities words */ + case 3: + ret = afs_extract_data(call, false); + if (ret < 0) + return ret; call->unmarshall++; break; diff --git a/fs/afs/internal.h b/fs/afs/internal.h index c97618855b46..b0fe27ae60db 100644 --- a/fs/afs/internal.h +++ b/fs/afs/internal.h @@ -520,6 +520,7 @@ struct afs_server { #define AFS_SERVER_FL_IS_YFS 16 /* Server is YFS not AFS */ #define AFS_SERVER_FL_NO_IBULK 17 /* Fileserver doesn't support FS.InlineBulkStatus */ #define AFS_SERVER_FL_NO_RM2 18 /* Fileserver doesn't support YFS.RemoveFile2 */ +#define AFS_SERVER_FL_HAS_FS64 19 /* Fileserver supports FS.{Fetch,Store}Data64 */ atomic_t ref; /* Object refcount */ atomic_t active; /* Active user count */ u32 addr_version; /* Address list version */ diff --git a/fs/afs/protocol_afs.h b/fs/afs/protocol_afs.h new file mode 100644 index 000000000000..0c39358c8b70 --- /dev/null +++ b/fs/afs/protocol_afs.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* AFS protocol bits + * + * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + */ + + +#define AFSCAPABILITIESMAX 196 /* Maximum number of words in a capability set */ + +/* AFS3 Fileserver capabilities word 0 */ +#define AFS3_VICED_CAPABILITY_ERRORTRANS 0x0001 /* Uses UAE errors */ +#define AFS3_VICED_CAPABILITY_64BITFILES 0x0002 /* FetchData64 & StoreData64 supported */ +#define AFS3_VICED_CAPABILITY_WRITELOCKACL 0x0004 /* Can lock a file even without lock perm */ +#define AFS3_VICED_CAPABILITY_SANEACLS 0x0008 /* ACLs reviewed for sanity - don't use */ diff --git a/fs/afs/protocol_yfs.h b/fs/afs/protocol_yfs.h index b5bd03b1d3c7..e4cd89c44c46 100644 --- a/fs/afs/protocol_yfs.h +++ b/fs/afs/protocol_yfs.h @@ -168,3 +168,9 @@ enum yfs_lock_type { yfs_LockMandatoryWrite = 0x101, yfs_LockMandatoryExtend = 0x102, }; + +/* RXYFS Viced Capability Flags */ +#define YFS_VICED_CAPABILITY_ERRORTRANS 0x0001 /* Deprecated v0.195 */ +#define YFS_VICED_CAPABILITY_64BITFILES 0x0002 /* Deprecated v0.195 */ +#define YFS_VICED_CAPABILITY_WRITELOCKACL 0x0004 /* Can lock a file even without lock perm */ +#define YFS_VICED_CAPABILITY_SANEACLS 0x0008 /* Deprecated v0.195 */ From 9d37e1cab2a9d2cee2737973fa455e6f89eee46a Mon Sep 17 00:00:00 2001 From: David Howells Date: Wed, 8 Sep 2021 21:55:19 +0100 Subject: [PATCH 11/26] afs: Fix updating of i_blocks on file/dir extension When an afs file or directory is modified locally such that the total file size is extended, i_blocks needs to be recalculated too. Fix this by making afs_write_end() and afs_edit_dir_add() call afs_set_i_size() rather than setting inode->i_size directly as that also recalculates inode->i_blocks. This can be tested by creating and writing into directories and files and then examining them with du. Without this change, directories show a 4 blocks (they start out at 2048 bytes) and files show 0 blocks; with this change, they should show a number of blocks proportional to the file size rounded up to 1024. Fixes: 31143d5d515e ("AFS: implement basic file write support") Fixes: 63a4681ff39c ("afs: Locally edit directory data for mkdir/create/unlink/...") Reported-by: Markus Suvanto Signed-off-by: David Howells Reviewed-by: Marc Dionne Tested-by: Markus Suvanto cc: linux-afs@lists.infradead.org Link: https://lore.kernel.org/r/163113612442.352844.11162345591911691150.stgit@warthog.procyon.org.uk/ --- fs/afs/dir_edit.c | 4 ++-- fs/afs/inode.c | 10 ---------- fs/afs/internal.h | 10 ++++++++++ fs/afs/write.c | 2 +- 4 files changed, 13 insertions(+), 13 deletions(-) diff --git a/fs/afs/dir_edit.c b/fs/afs/dir_edit.c index f4600c1353ad..540b9fc96824 100644 --- a/fs/afs/dir_edit.c +++ b/fs/afs/dir_edit.c @@ -263,7 +263,7 @@ void afs_edit_dir_add(struct afs_vnode *vnode, if (b == nr_blocks) { _debug("init %u", b); afs_edit_init_block(meta, block, b); - i_size_write(&vnode->vfs_inode, (b + 1) * AFS_DIR_BLOCK_SIZE); + afs_set_i_size(vnode, (b + 1) * AFS_DIR_BLOCK_SIZE); } /* Only lower dir pages have a counter in the header. */ @@ -296,7 +296,7 @@ void afs_edit_dir_add(struct afs_vnode *vnode, new_directory: afs_edit_init_block(meta, meta, 0); i_size = AFS_DIR_BLOCK_SIZE; - i_size_write(&vnode->vfs_inode, i_size); + afs_set_i_size(vnode, i_size); slot = AFS_DIR_RESV_BLOCKS0; page = page0; block = meta; diff --git a/fs/afs/inode.c b/fs/afs/inode.c index 126daf9969db..8fcffea2daf5 100644 --- a/fs/afs/inode.c +++ b/fs/afs/inode.c @@ -53,16 +53,6 @@ static noinline void dump_vnode(struct afs_vnode *vnode, struct afs_vnode *paren dump_stack(); } -/* - * Set the file size and block count. Estimate the number of 512 bytes blocks - * used, rounded up to nearest 1K for consistency with other AFS clients. - */ -static void afs_set_i_size(struct afs_vnode *vnode, u64 size) -{ - i_size_write(&vnode->vfs_inode, size); - vnode->vfs_inode.i_blocks = ((size + 1023) >> 10) << 1; -} - /* * Initialise an inode from the vnode status. */ diff --git a/fs/afs/internal.h b/fs/afs/internal.h index b0fe27ae60db..0ad97a8fc0d4 100644 --- a/fs/afs/internal.h +++ b/fs/afs/internal.h @@ -1596,6 +1596,16 @@ static inline void afs_update_dentry_version(struct afs_operation *op, (void *)(unsigned long)dir_vp->scb.status.data_version; } +/* + * Set the file size and block count. Estimate the number of 512 bytes blocks + * used, rounded up to nearest 1K for consistency with other AFS clients. + */ +static inline void afs_set_i_size(struct afs_vnode *vnode, u64 size) +{ + i_size_write(&vnode->vfs_inode, size); + vnode->vfs_inode.i_blocks = ((size + 1023) >> 10) << 1; +} + /* * Check for a conflicting operation on a directory that we just unlinked from. * If someone managed to sneak a link or an unlink in on the file we just diff --git a/fs/afs/write.c b/fs/afs/write.c index 32a764c24284..2dfe3b3a53d6 100644 --- a/fs/afs/write.c +++ b/fs/afs/write.c @@ -137,7 +137,7 @@ int afs_write_end(struct file *file, struct address_space *mapping, write_seqlock(&vnode->cb_lock); i_size = i_size_read(&vnode->vfs_inode); if (maybe_i_size > i_size) - i_size_write(&vnode->vfs_inode, maybe_i_size); + afs_set_i_size(vnode, maybe_i_size); write_sequnlock(&vnode->cb_lock); } From 099dd788e31b4f426ef49c2785069804925a84e1 Mon Sep 17 00:00:00 2001 From: Steve French Date: Mon, 13 Sep 2021 14:51:10 -0500 Subject: [PATCH 12/26] cifs: remove pathname for file from SPDX header checkpatch complains about source files with filenames (e.g. in these cases just below the SPDX header in comments at the top of various files in fs/cifs). It also is helpful to change this now so will be less confusing when the parent directory is renamed e.g. from fs/cifs to fs/smb_client (or fs/smbfs) Reviewed-by: Ronnie Sahlberg Signed-off-by: Steve French --- fs/cifs/cache.c | 2 +- fs/cifs/cifs_debug.c | 1 - fs/cifs/cifs_fs_sb.h | 1 - fs/cifs/cifs_ioctl.h | 1 - fs/cifs/cifs_spnego.c | 2 +- fs/cifs/cifs_spnego.h | 2 +- fs/cifs/cifs_unicode.c | 1 - fs/cifs/cifsacl.c | 1 - fs/cifs/cifsacl.h | 1 - fs/cifs/cifsencrypt.c | 1 - fs/cifs/cifsfs.c | 1 - fs/cifs/cifsfs.h | 1 - fs/cifs/cifsglob.h | 1 - fs/cifs/cifspdu.h | 1 - fs/cifs/cifsproto.h | 1 - fs/cifs/cifssmb.c | 1 - fs/cifs/connect.c | 1 - fs/cifs/dir.c | 1 - fs/cifs/dns_resolve.c | 1 - fs/cifs/dns_resolve.h | 4 ++-- fs/cifs/export.c | 1 - fs/cifs/file.c | 1 - fs/cifs/fscache.c | 2 +- fs/cifs/fscache.h | 2 +- fs/cifs/inode.c | 1 - fs/cifs/ioctl.c | 1 - fs/cifs/link.c | 1 - fs/cifs/misc.c | 1 - fs/cifs/netmisc.c | 1 - fs/cifs/ntlmssp.h | 1 - fs/cifs/readdir.c | 1 - fs/cifs/rfc1002pdu.h | 1 - fs/cifs/sess.c | 1 - fs/cifs/smb2file.c | 1 - fs/cifs/smb2glob.h | 1 - fs/cifs/smb2inode.c | 1 - fs/cifs/smb2misc.c | 1 - fs/cifs/smb2pdu.c | 1 - fs/cifs/smb2pdu.h | 1 - fs/cifs/smb2proto.h | 1 - fs/cifs/smb2status.h | 1 - fs/cifs/smb2transport.c | 1 - fs/cifs/smberr.h | 1 - fs/cifs/transport.c | 1 - fs/cifs/winucase.c | 1 - fs/cifs/xattr.c | 1 - fs/smbfs_common/smbfsctl.h | 2 +- include/uapi/linux/cifs/cifs_mount.h | 1 - 48 files changed, 8 insertions(+), 49 deletions(-) diff --git a/fs/cifs/cache.c b/fs/cifs/cache.c index 8a3b30ec860c..8be57aaedab6 100644 --- a/fs/cifs/cache.c +++ b/fs/cifs/cache.c @@ -1,6 +1,6 @@ // SPDX-License-Identifier: LGPL-2.1 /* - * fs/cifs/cache.c - CIFS filesystem cache index structure definitions + * CIFS filesystem cache index structure definitions * * Copyright (c) 2010 Novell, Inc. * Authors(s): Suresh Jayaraman (sjayaraman@suse.de> diff --git a/fs/cifs/cifs_debug.c b/fs/cifs/cifs_debug.c index 51a824fc926a..de2c12bcfa4b 100644 --- a/fs/cifs/cifs_debug.c +++ b/fs/cifs/cifs_debug.c @@ -1,6 +1,5 @@ // SPDX-License-Identifier: GPL-2.0-or-later /* - * fs/cifs_debug.c * * Copyright (C) International Business Machines Corp., 2000,2005 * diff --git a/fs/cifs/cifs_fs_sb.h b/fs/cifs/cifs_fs_sb.h index 4fd788586399..f97407520ea1 100644 --- a/fs/cifs/cifs_fs_sb.h +++ b/fs/cifs/cifs_fs_sb.h @@ -1,6 +1,5 @@ /* SPDX-License-Identifier: LGPL-2.1 */ /* - * fs/cifs/cifs_fs_sb.h * * Copyright (c) International Business Machines Corp., 2002,2004 * Author(s): Steve French (sfrench@us.ibm.com) diff --git a/fs/cifs/cifs_ioctl.h b/fs/cifs/cifs_ioctl.h index ef723be358af..b87cbbe6d2d4 100644 --- a/fs/cifs/cifs_ioctl.h +++ b/fs/cifs/cifs_ioctl.h @@ -1,6 +1,5 @@ /* SPDX-License-Identifier: LGPL-2.1 */ /* - * fs/cifs/cifs_ioctl.h * * Structure definitions for io control for cifs/smb3 * diff --git a/fs/cifs/cifs_spnego.c b/fs/cifs/cifs_spnego.c index 8fa26a8530f8..353bd0dd7026 100644 --- a/fs/cifs/cifs_spnego.c +++ b/fs/cifs/cifs_spnego.c @@ -1,6 +1,6 @@ // SPDX-License-Identifier: LGPL-2.1 /* - * fs/cifs/cifs_spnego.c -- SPNEGO upcall management for CIFS + * SPNEGO upcall management for CIFS * * Copyright (c) 2007 Red Hat, Inc. * Author(s): Jeff Layton (jlayton@redhat.com) diff --git a/fs/cifs/cifs_spnego.h b/fs/cifs/cifs_spnego.h index 31387d0ea32e..e6a0451877d4 100644 --- a/fs/cifs/cifs_spnego.h +++ b/fs/cifs/cifs_spnego.h @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: LGPL-2.1 */ /* - * fs/cifs/cifs_spnego.h -- SPNEGO upcall management for CIFS + * SPNEGO upcall management for CIFS * * Copyright (c) 2007 Red Hat, Inc. * Author(s): Jeff Layton (jlayton@redhat.com) diff --git a/fs/cifs/cifs_unicode.c b/fs/cifs/cifs_unicode.c index 171ad8b42107..e7582dd79179 100644 --- a/fs/cifs/cifs_unicode.c +++ b/fs/cifs/cifs_unicode.c @@ -1,6 +1,5 @@ // SPDX-License-Identifier: GPL-2.0-or-later /* - * fs/cifs/cifs_unicode.c * * Copyright (c) International Business Machines Corp., 2000,2009 * Modified by Steve French (sfrench@us.ibm.com) diff --git a/fs/cifs/cifsacl.c b/fs/cifs/cifsacl.c index 388eb536cff1..ee3aab3dd4ac 100644 --- a/fs/cifs/cifsacl.c +++ b/fs/cifs/cifsacl.c @@ -1,6 +1,5 @@ // SPDX-License-Identifier: LGPL-2.1 /* - * fs/cifs/cifsacl.c * * Copyright (C) International Business Machines Corp., 2007,2008 * Author(s): Steve French (sfrench@us.ibm.com) diff --git a/fs/cifs/cifsacl.h b/fs/cifs/cifsacl.h index f8292bcf8594..ccbfc754bd3c 100644 --- a/fs/cifs/cifsacl.h +++ b/fs/cifs/cifsacl.h @@ -1,6 +1,5 @@ /* SPDX-License-Identifier: LGPL-2.1 */ /* - * fs/cifs/cifsacl.h * * Copyright (c) International Business Machines Corp., 2007 * Author(s): Steve French (sfrench@us.ibm.com) diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c index 2e6f40344037..d118282071b3 100644 --- a/fs/cifs/cifsencrypt.c +++ b/fs/cifs/cifsencrypt.c @@ -1,6 +1,5 @@ // SPDX-License-Identifier: LGPL-2.1 /* - * fs/cifs/cifsencrypt.c * * Encryption and hashing operations relating to NTLM, NTLMv2. See MS-NLMP * for more detailed information diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c index 8c20bfa187ac..9fa930dfd78d 100644 --- a/fs/cifs/cifsfs.c +++ b/fs/cifs/cifsfs.c @@ -1,6 +1,5 @@ // SPDX-License-Identifier: LGPL-2.1 /* - * fs/cifs/cifsfs.c * * Copyright (C) International Business Machines Corp., 2002,2008 * Author(s): Steve French (sfrench@us.ibm.com) diff --git a/fs/cifs/cifsfs.h b/fs/cifs/cifsfs.h index d25a4099b32e..b50da1901ebd 100644 --- a/fs/cifs/cifsfs.h +++ b/fs/cifs/cifsfs.h @@ -1,6 +1,5 @@ /* SPDX-License-Identifier: LGPL-2.1 */ /* - * fs/cifs/cifsfs.h * * Copyright (c) International Business Machines Corp., 2002, 2007 * Author(s): Steve French (sfrench@us.ibm.com) diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h index c068f7d8d879..7dd9878e26bf 100644 --- a/fs/cifs/cifsglob.h +++ b/fs/cifs/cifsglob.h @@ -1,6 +1,5 @@ /* SPDX-License-Identifier: LGPL-2.1 */ /* - * fs/cifs/cifsglob.h * * Copyright (C) International Business Machines Corp., 2002,2008 * Author(s): Steve French (sfrench@us.ibm.com) diff --git a/fs/cifs/cifspdu.h b/fs/cifs/cifspdu.h index 98e8e5aa0613..d2ff438fd31f 100644 --- a/fs/cifs/cifspdu.h +++ b/fs/cifs/cifspdu.h @@ -1,6 +1,5 @@ /* SPDX-License-Identifier: LGPL-2.1 */ /* - * fs/cifs/cifspdu.h * * Copyright (c) International Business Machines Corp., 2002,2009 * Author(s): Steve French (sfrench@us.ibm.com) diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h index f9740c21ca3d..54966c1a8eb6 100644 --- a/fs/cifs/cifsproto.h +++ b/fs/cifs/cifsproto.h @@ -1,6 +1,5 @@ /* SPDX-License-Identifier: LGPL-2.1 */ /* - * fs/cifs/cifsproto.h * * Copyright (c) International Business Machines Corp., 2002,2008 * Author(s): Steve French (sfrench@us.ibm.com) diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c index a8e41c1e80ca..243d17696f06 100644 --- a/fs/cifs/cifssmb.c +++ b/fs/cifs/cifssmb.c @@ -1,6 +1,5 @@ // SPDX-License-Identifier: LGPL-2.1 /* - * fs/cifs/cifssmb.c * * Copyright (C) International Business Machines Corp., 2002,2010 * Author(s): Steve French (sfrench@us.ibm.com) diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index 0db344807ef1..399a0f084573 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -1,6 +1,5 @@ // SPDX-License-Identifier: LGPL-2.1 /* - * fs/cifs/connect.c * * Copyright (C) International Business Machines Corp., 2002,2011 * Author(s): Steve French (sfrench@us.ibm.com) diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c index 5f8a302ffcb2..6e8e7cc26ae2 100644 --- a/fs/cifs/dir.c +++ b/fs/cifs/dir.c @@ -1,6 +1,5 @@ // SPDX-License-Identifier: LGPL-2.1 /* - * fs/cifs/dir.c * * vfs operations that deal with dentries * diff --git a/fs/cifs/dns_resolve.c b/fs/cifs/dns_resolve.c index 8c616aaeb7c4..0458d28d71aa 100644 --- a/fs/cifs/dns_resolve.c +++ b/fs/cifs/dns_resolve.c @@ -1,6 +1,5 @@ // SPDX-License-Identifier: LGPL-2.1 /* - * fs/cifs/dns_resolve.c * * Copyright (c) 2007 Igor Mammedov * Author(s): Igor Mammedov (niallain@gmail.com) diff --git a/fs/cifs/dns_resolve.h b/fs/cifs/dns_resolve.h index 9fa2807ef79e..afc0df381246 100644 --- a/fs/cifs/dns_resolve.h +++ b/fs/cifs/dns_resolve.h @@ -1,7 +1,7 @@ /* SPDX-License-Identifier: LGPL-2.1 */ /* - * fs/cifs/dns_resolve.h -- DNS Resolver upcall management for CIFS DFS - * Handles host name to IP address resolution + * DNS Resolver upcall management for CIFS DFS + * Handles host name to IP address resolution * * Copyright (c) International Business Machines Corp., 2008 * Author(s): Steve French (sfrench@us.ibm.com) diff --git a/fs/cifs/export.c b/fs/cifs/export.c index 747a540db954..37c28415df1e 100644 --- a/fs/cifs/export.c +++ b/fs/cifs/export.c @@ -1,6 +1,5 @@ // SPDX-License-Identifier: LGPL-2.1 /* - * fs/cifs/export.c * * Copyright (C) International Business Machines Corp., 2007 * Author(s): Steve French (sfrench@us.ibm.com) diff --git a/fs/cifs/file.c b/fs/cifs/file.c index d0216472f1c6..4d10c9343890 100644 --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -1,6 +1,5 @@ // SPDX-License-Identifier: LGPL-2.1 /* - * fs/cifs/file.c * * vfs operations that deal with files * diff --git a/fs/cifs/fscache.c b/fs/cifs/fscache.c index fab47fa7df74..8eedd20c44ab 100644 --- a/fs/cifs/fscache.c +++ b/fs/cifs/fscache.c @@ -1,6 +1,6 @@ // SPDX-License-Identifier: LGPL-2.1 /* - * fs/cifs/fscache.c - CIFS filesystem cache interface + * CIFS filesystem cache interface * * Copyright (c) 2010 Novell, Inc. * Author(s): Suresh Jayaraman diff --git a/fs/cifs/fscache.h b/fs/cifs/fscache.h index 82e856b9cf89..9baa1d0f22bd 100644 --- a/fs/cifs/fscache.h +++ b/fs/cifs/fscache.h @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: LGPL-2.1 */ /* - * fs/cifs/fscache.h - CIFS filesystem cache interface definitions + * CIFS filesystem cache interface definitions * * Copyright (c) 2010 Novell, Inc. * Authors(s): Suresh Jayaraman (sjayaraman@suse.de> diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c index 50c01cff4c84..19af2d0ec8d5 100644 --- a/fs/cifs/inode.c +++ b/fs/cifs/inode.c @@ -1,6 +1,5 @@ // SPDX-License-Identifier: LGPL-2.1 /* - * fs/cifs/inode.c * * Copyright (C) International Business Machines Corp., 2002,2010 * Author(s): Steve French (sfrench@us.ibm.com) diff --git a/fs/cifs/ioctl.c b/fs/cifs/ioctl.c index 42c6a0bac6c8..44ae99454fb3 100644 --- a/fs/cifs/ioctl.c +++ b/fs/cifs/ioctl.c @@ -1,6 +1,5 @@ // SPDX-License-Identifier: LGPL-2.1 /* - * fs/cifs/ioctl.c * * vfs operations that deal with io control * diff --git a/fs/cifs/link.c b/fs/cifs/link.c index f0a6d63bc08c..852e54ee82c2 100644 --- a/fs/cifs/link.c +++ b/fs/cifs/link.c @@ -1,6 +1,5 @@ // SPDX-License-Identifier: LGPL-2.1 /* - * fs/cifs/link.c * * Copyright (C) International Business Machines Corp., 2002,2008 * Author(s): Steve French (sfrench@us.ibm.com) diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c index 9469f1cf0b46..f4313935e734 100644 --- a/fs/cifs/misc.c +++ b/fs/cifs/misc.c @@ -1,6 +1,5 @@ // SPDX-License-Identifier: LGPL-2.1 /* - * fs/cifs/misc.c * * Copyright (C) International Business Machines Corp., 2002,2008 * Author(s): Steve French (sfrench@us.ibm.com) diff --git a/fs/cifs/netmisc.c b/fs/cifs/netmisc.c index 0e728aac67e9..fa9fbd6a819c 100644 --- a/fs/cifs/netmisc.c +++ b/fs/cifs/netmisc.c @@ -1,6 +1,5 @@ // SPDX-License-Identifier: GPL-2.0-or-later /* - * fs/cifs/netmisc.c * * Copyright (c) International Business Machines Corp., 2002,2008 * Author(s): Steve French (sfrench@us.ibm.com) diff --git a/fs/cifs/ntlmssp.h b/fs/cifs/ntlmssp.h index 378133ce8869..25a2b8ef88b9 100644 --- a/fs/cifs/ntlmssp.h +++ b/fs/cifs/ntlmssp.h @@ -1,6 +1,5 @@ /* SPDX-License-Identifier: LGPL-2.1 */ /* - * fs/cifs/ntlmssp.h * * Copyright (c) International Business Machines Corp., 2002,2007 * Author(s): Steve French (sfrench@us.ibm.com) diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c index 54d77c99e21c..1929e80c09ee 100644 --- a/fs/cifs/readdir.c +++ b/fs/cifs/readdir.c @@ -1,6 +1,5 @@ // SPDX-License-Identifier: LGPL-2.1 /* - * fs/cifs/readdir.c * * Directory search handling * diff --git a/fs/cifs/rfc1002pdu.h b/fs/cifs/rfc1002pdu.h index 137f7c95afd6..ae1d025da294 100644 --- a/fs/cifs/rfc1002pdu.h +++ b/fs/cifs/rfc1002pdu.h @@ -1,6 +1,5 @@ /* SPDX-License-Identifier: LGPL-2.1 */ /* - * fs/cifs/rfc1002pdu.h * * Protocol Data Unit definitions for RFC 1001/1002 support * diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c index 118403fbeda2..23e02db7923f 100644 --- a/fs/cifs/sess.c +++ b/fs/cifs/sess.c @@ -1,6 +1,5 @@ // SPDX-License-Identifier: LGPL-2.1 /* - * fs/cifs/sess.c * * SMB/CIFS session setup handling routines * diff --git a/fs/cifs/smb2file.c b/fs/cifs/smb2file.c index c9d8a50062b8..f5dcc4940b6d 100644 --- a/fs/cifs/smb2file.c +++ b/fs/cifs/smb2file.c @@ -1,6 +1,5 @@ // SPDX-License-Identifier: LGPL-2.1 /* - * fs/cifs/smb2file.c * * Copyright (C) International Business Machines Corp., 2002, 2011 * Author(s): Steve French (sfrench@us.ibm.com), diff --git a/fs/cifs/smb2glob.h b/fs/cifs/smb2glob.h index d0e9f3782bd9..ca692b2283cd 100644 --- a/fs/cifs/smb2glob.h +++ b/fs/cifs/smb2glob.h @@ -1,6 +1,5 @@ /* SPDX-License-Identifier: LGPL-2.1 */ /* - * fs/cifs/smb2glob.h * * Definitions for various global variables and structures * diff --git a/fs/cifs/smb2inode.c b/fs/cifs/smb2inode.c index 957b2594f02e..8297703492ee 100644 --- a/fs/cifs/smb2inode.c +++ b/fs/cifs/smb2inode.c @@ -1,6 +1,5 @@ // SPDX-License-Identifier: LGPL-2.1 /* - * fs/cifs/smb2inode.c * * Copyright (C) International Business Machines Corp., 2002, 2011 * Etersoft, 2012 diff --git a/fs/cifs/smb2misc.c b/fs/cifs/smb2misc.c index 668f77108831..29b5554f6263 100644 --- a/fs/cifs/smb2misc.c +++ b/fs/cifs/smb2misc.c @@ -1,6 +1,5 @@ // SPDX-License-Identifier: LGPL-2.1 /* - * fs/cifs/smb2misc.c * * Copyright (C) International Business Machines Corp., 2002,2011 * Etersoft, 2012 diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c index b6d2e3591927..672ae78e866a 100644 --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -1,6 +1,5 @@ // SPDX-License-Identifier: LGPL-2.1 /* - * fs/cifs/smb2pdu.c * * Copyright (C) International Business Machines Corp., 2009, 2013 * Etersoft, 2012 diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h index e9cac7970b66..f32c99c9ba13 100644 --- a/fs/cifs/smb2pdu.h +++ b/fs/cifs/smb2pdu.h @@ -1,6 +1,5 @@ /* SPDX-License-Identifier: LGPL-2.1 */ /* - * fs/cifs/smb2pdu.h * * Copyright (c) International Business Machines Corp., 2009, 2013 * Etersoft, 2012 diff --git a/fs/cifs/smb2proto.h b/fs/cifs/smb2proto.h index 263767f644f8..547945443fa7 100644 --- a/fs/cifs/smb2proto.h +++ b/fs/cifs/smb2proto.h @@ -1,6 +1,5 @@ /* SPDX-License-Identifier: LGPL-2.1 */ /* - * fs/cifs/smb2proto.h * * Copyright (c) International Business Machines Corp., 2002, 2011 * Etersoft, 2012 diff --git a/fs/cifs/smb2status.h b/fs/cifs/smb2status.h index 0215ef36e240..a9e958166fc5 100644 --- a/fs/cifs/smb2status.h +++ b/fs/cifs/smb2status.h @@ -1,6 +1,5 @@ /* SPDX-License-Identifier: LGPL-2.1 */ /* - * fs/cifs/smb2status.h * * SMB2 Status code (network error) definitions * Definitions are from MS-ERREF diff --git a/fs/cifs/smb2transport.c b/fs/cifs/smb2transport.c index 6f7952ea4941..f59b956f9d25 100644 --- a/fs/cifs/smb2transport.c +++ b/fs/cifs/smb2transport.c @@ -1,6 +1,5 @@ // SPDX-License-Identifier: LGPL-2.1 /* - * fs/cifs/smb2transport.c * * Copyright (C) International Business Machines Corp., 2002, 2011 * Etersoft, 2012 diff --git a/fs/cifs/smberr.h b/fs/cifs/smberr.h index 60189efb3236..aeffdad829e2 100644 --- a/fs/cifs/smberr.h +++ b/fs/cifs/smberr.h @@ -1,6 +1,5 @@ /* SPDX-License-Identifier: LGPL-2.1 */ /* - * fs/cifs/smberr.h * * Copyright (c) International Business Machines Corp., 2002,2004 * Author(s): Steve French (sfrench@us.ibm.com) diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c index 75a95de320cf..b7379329b741 100644 --- a/fs/cifs/transport.c +++ b/fs/cifs/transport.c @@ -1,6 +1,5 @@ // SPDX-License-Identifier: LGPL-2.1 /* - * fs/cifs/transport.c * * Copyright (C) International Business Machines Corp., 2002,2008 * Author(s): Steve French (sfrench@us.ibm.com) diff --git a/fs/cifs/winucase.c b/fs/cifs/winucase.c index 59b6c577aa0a..2f075b5b50df 100644 --- a/fs/cifs/winucase.c +++ b/fs/cifs/winucase.c @@ -1,6 +1,5 @@ // SPDX-License-Identifier: GPL-2.0-or-later /* - * fs/cifs/winucase.c * * Copyright (c) Jeffrey Layton , 2013 * diff --git a/fs/cifs/xattr.c b/fs/cifs/xattr.c index 9ed481e79ce0..7d8b72d67c80 100644 --- a/fs/cifs/xattr.c +++ b/fs/cifs/xattr.c @@ -1,6 +1,5 @@ // SPDX-License-Identifier: LGPL-2.1 /* - * fs/cifs/xattr.c * * Copyright (c) International Business Machines Corp., 2003, 2007 * Author(s): Steve French (sfrench@us.ibm.com) diff --git a/fs/smbfs_common/smbfsctl.h b/fs/smbfs_common/smbfsctl.h index d01e8c9d7a31..926f87cd6af0 100644 --- a/fs/smbfs_common/smbfsctl.h +++ b/fs/smbfs_common/smbfsctl.h @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: LGPL-2.1+ */ /* - * fs/cifs/smbfsctl.h: SMB, CIFS, SMB2 FSCTL definitions + * SMB, CIFS, SMB2 FSCTL definitions * * Copyright (c) International Business Machines Corp., 2002,2013 * Author(s): Steve French (sfrench@us.ibm.com) diff --git a/include/uapi/linux/cifs/cifs_mount.h b/include/uapi/linux/cifs/cifs_mount.h index 69829205fdb5..8e87d27b0951 100644 --- a/include/uapi/linux/cifs/cifs_mount.h +++ b/include/uapi/linux/cifs/cifs_mount.h @@ -1,6 +1,5 @@ /* SPDX-License-Identifier: LGPL-2.1+ WITH Linux-syscall-note */ /* - * include/uapi/linux/cifs/cifs_mount.h * * Author(s): Scott Lovenberg (scott.lovenberg@gmail.com) * From 4c51de1e8f928a5b05248714d832d7d991ac319a Mon Sep 17 00:00:00 2001 From: Steve French Date: Mon, 13 Sep 2021 18:29:46 -0500 Subject: [PATCH 13/26] cifs: fix incorrect kernel doc comments Correct kernel-doc comments pointed out by the automated kernel test robot. Reported-by: kernel test robot Signed-off-by: Steve French --- fs/cifs/connect.c | 12 ++++++++++-- fs/cifs/ioctl.c | 2 +- 2 files changed, 11 insertions(+), 3 deletions(-) diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index 399a0f084573..7881115cfbee 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -1089,7 +1089,7 @@ next_pdu: module_put_and_exit(0); } -/** +/* * Returns true if srcaddr isn't specified and rhs isn't specified, or * if srcaddr is specified and matches the IP address of the rhs argument */ @@ -1549,6 +1549,9 @@ static int match_session(struct cifs_ses *ses, struct smb3_fs_context *ctx) /** * cifs_setup_ipc - helper to setup the IPC tcon for the session + * @ses: smb session to issue the request on + * @ctx: the superblock configuration context to use for building the + * new tree connection for the IPC (interprocess communication RPC) * * A new IPC connection is made and stored in the session * tcon_ipc. The IPC tcon has the same lifetime as the session. @@ -1604,6 +1607,7 @@ out: /** * cifs_free_ipc - helper to release the session IPC tcon + * @ses: smb session to unmount the IPC from * * Needs to be called everytime a session is destroyed. * @@ -1854,6 +1858,8 @@ cifs_set_cifscreds(struct smb3_fs_context *ctx __attribute__((unused)), /** * cifs_get_smb_ses - get a session matching @ctx data from @server + * @server: server to setup the session to + * @ctx: superblock configuration context to use to setup the session * * This function assumes it is being called from cifs_mount() where we * already got a server reference (server refcount +1). See @@ -2064,6 +2070,8 @@ cifs_put_tcon(struct cifs_tcon *tcon) /** * cifs_get_tcon - get a tcon matching @ctx data from @ses + * @ses: smb session to issue the request on + * @ctx: the superblock configuration context to use for building the * * - tcon refcount is the number of mount points using the tcon. * - ses refcount is the number of tcon using the session. @@ -3029,7 +3037,7 @@ build_unc_path_to_root(const struct smb3_fs_context *ctx, return full_path; } -/** +/* * expand_dfs_referral - Perform a dfs referral query and update the cifs_sb * * If a referral is found, cifs_sb->ctx->mount_options will be (re-)allocated diff --git a/fs/cifs/ioctl.c b/fs/cifs/ioctl.c index 44ae99454fb3..0359b604bdbc 100644 --- a/fs/cifs/ioctl.c +++ b/fs/cifs/ioctl.c @@ -358,7 +358,7 @@ long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg) if (pSMBFile == NULL) break; tcon = tlink_tcon(pSMBFile->tlink); - caps = le64_to_cpu(tcon->fsUnixInfo.Capability); + /* caps = le64_to_cpu(tcon->fsUnixInfo.Capability); */ if (get_user(ExtAttrBits, (int __user *)arg)) { rc = -EFAULT; From 1511df6f5e9ef32826f20db2ee81f8527154dc14 Mon Sep 17 00:00:00 2001 From: Ilya Leoshkevich Date: Tue, 7 Sep 2021 11:58:59 +0200 Subject: [PATCH 14/26] s390/bpf: Fix branch shortening during codegen pass EMIT6_PCREL() macro assumes that the previous pass generated 6 bytes of code, which is not the case if branch shortening took place. Fix by using jit->prg, like all the other EMIT6_PCREL_*() macros. Reported-by: Johan Almbladh Fixes: 4e9b4a6883dd ("s390/bpf: Use relative long branches") Signed-off-by: Ilya Leoshkevich Signed-off-by: Vasily Gorbik --- arch/s390/net/bpf_jit_comp.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c index 88419263a89a..c3bd630e9b43 100644 --- a/arch/s390/net/bpf_jit_comp.c +++ b/arch/s390/net/bpf_jit_comp.c @@ -248,8 +248,7 @@ static inline void reg_set_seen(struct bpf_jit *jit, u32 b1) #define EMIT6_PCREL(op1, op2, b1, b2, i, off, mask) \ ({ \ - /* Branch instruction needs 6 bytes */ \ - int rel = (addrs[(i) + (off) + 1] - (addrs[(i) + 1] - 6)) / 2;\ + int rel = (addrs[(i) + (off) + 1] - jit->prg) / 2; \ _EMIT6((op1) | reg(b1, b2) << 16 | (rel & 0xffff), (op2) | (mask));\ REG_SET_SEEN(b1); \ REG_SET_SEEN(b2); \ From 6e61dc9da0b7a0d91d57c2e20b5ea4fd2d4e7e53 Mon Sep 17 00:00:00 2001 From: Ilya Leoshkevich Date: Tue, 7 Sep 2021 13:41:16 +0200 Subject: [PATCH 15/26] s390/bpf: Fix 64-bit subtraction of the -0x80000000 constant The JIT uses agfi for subtracting constants, but -(-0x80000000) cannot be represented as a 32-bit signed binary integer. Fix by using algfi in this particular case. Reported-by: Johan Almbladh Fixes: 054623105728 ("s390/bpf: Add s390x eBPF JIT compiler backend") Reviewed-by: Heiko Carstens Signed-off-by: Ilya Leoshkevich Signed-off-by: Vasily Gorbik --- arch/s390/net/bpf_jit_comp.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c index c3bd630e9b43..245f98d5f690 100644 --- a/arch/s390/net/bpf_jit_comp.c +++ b/arch/s390/net/bpf_jit_comp.c @@ -794,8 +794,13 @@ static noinline int bpf_jit_insn(struct bpf_jit *jit, struct bpf_prog *fp, case BPF_ALU64 | BPF_SUB | BPF_K: /* dst = dst - imm */ if (!imm) break; - /* agfi %dst,-imm */ - EMIT6_IMM(0xc2080000, dst_reg, -imm); + if (imm == -0x80000000) { + /* algfi %dst,0x80000000 */ + EMIT6_IMM(0xc20a0000, dst_reg, 0x80000000); + } else { + /* agfi %dst,-imm */ + EMIT6_IMM(0xc2080000, dst_reg, -imm); + } break; /* * BPF_MUL From db7bee653859ef7179be933e7d1384644f795f26 Mon Sep 17 00:00:00 2001 From: Ilya Leoshkevich Date: Mon, 6 Sep 2021 15:04:14 +0200 Subject: [PATCH 16/26] s390/bpf: Fix optimizing out zero-extensions Currently the JIT completely removes things like `reg32 += 0`, however, the BPF_ALU semantics requires the target register to be zero-extended in such cases. Fix by optimizing out only the arithmetic operation, but not the subsequent zero-extension. Reported-by: Johan Almbladh Fixes: 054623105728 ("s390/bpf: Add s390x eBPF JIT compiler backend") Reviewed-by: Heiko Carstens Signed-off-by: Ilya Leoshkevich Signed-off-by: Vasily Gorbik --- arch/s390/net/bpf_jit_comp.c | 58 +++++++++++++++++++----------------- 1 file changed, 30 insertions(+), 28 deletions(-) diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c index 245f98d5f690..840d8594437d 100644 --- a/arch/s390/net/bpf_jit_comp.c +++ b/arch/s390/net/bpf_jit_comp.c @@ -760,10 +760,10 @@ static noinline int bpf_jit_insn(struct bpf_jit *jit, struct bpf_prog *fp, EMIT4(0xb9080000, dst_reg, src_reg); break; case BPF_ALU | BPF_ADD | BPF_K: /* dst = (u32) dst + (u32) imm */ - if (!imm) - break; - /* alfi %dst,imm */ - EMIT6_IMM(0xc20b0000, dst_reg, imm); + if (imm != 0) { + /* alfi %dst,imm */ + EMIT6_IMM(0xc20b0000, dst_reg, imm); + } EMIT_ZERO(dst_reg); break; case BPF_ALU64 | BPF_ADD | BPF_K: /* dst = dst + imm */ @@ -785,10 +785,10 @@ static noinline int bpf_jit_insn(struct bpf_jit *jit, struct bpf_prog *fp, EMIT4(0xb9090000, dst_reg, src_reg); break; case BPF_ALU | BPF_SUB | BPF_K: /* dst = (u32) dst - (u32) imm */ - if (!imm) - break; - /* alfi %dst,-imm */ - EMIT6_IMM(0xc20b0000, dst_reg, -imm); + if (imm != 0) { + /* alfi %dst,-imm */ + EMIT6_IMM(0xc20b0000, dst_reg, -imm); + } EMIT_ZERO(dst_reg); break; case BPF_ALU64 | BPF_SUB | BPF_K: /* dst = dst - imm */ @@ -815,10 +815,10 @@ static noinline int bpf_jit_insn(struct bpf_jit *jit, struct bpf_prog *fp, EMIT4(0xb90c0000, dst_reg, src_reg); break; case BPF_ALU | BPF_MUL | BPF_K: /* dst = (u32) dst * (u32) imm */ - if (imm == 1) - break; - /* msfi %r5,imm */ - EMIT6_IMM(0xc2010000, dst_reg, imm); + if (imm != 1) { + /* msfi %r5,imm */ + EMIT6_IMM(0xc2010000, dst_reg, imm); + } EMIT_ZERO(dst_reg); break; case BPF_ALU64 | BPF_MUL | BPF_K: /* dst = dst * imm */ @@ -871,6 +871,8 @@ static noinline int bpf_jit_insn(struct bpf_jit *jit, struct bpf_prog *fp, if (BPF_OP(insn->code) == BPF_MOD) /* lhgi %dst,0 */ EMIT4_IMM(0xa7090000, dst_reg, 0); + else + EMIT_ZERO(dst_reg); break; } /* lhi %w0,0 */ @@ -1003,10 +1005,10 @@ static noinline int bpf_jit_insn(struct bpf_jit *jit, struct bpf_prog *fp, EMIT4(0xb9820000, dst_reg, src_reg); break; case BPF_ALU | BPF_XOR | BPF_K: /* dst = (u32) dst ^ (u32) imm */ - if (!imm) - break; - /* xilf %dst,imm */ - EMIT6_IMM(0xc0070000, dst_reg, imm); + if (imm != 0) { + /* xilf %dst,imm */ + EMIT6_IMM(0xc0070000, dst_reg, imm); + } EMIT_ZERO(dst_reg); break; case BPF_ALU64 | BPF_XOR | BPF_K: /* dst = dst ^ imm */ @@ -1037,10 +1039,10 @@ static noinline int bpf_jit_insn(struct bpf_jit *jit, struct bpf_prog *fp, EMIT6_DISP_LH(0xeb000000, 0x000d, dst_reg, dst_reg, src_reg, 0); break; case BPF_ALU | BPF_LSH | BPF_K: /* dst = (u32) dst << (u32) imm */ - if (imm == 0) - break; - /* sll %dst,imm(%r0) */ - EMIT4_DISP(0x89000000, dst_reg, REG_0, imm); + if (imm != 0) { + /* sll %dst,imm(%r0) */ + EMIT4_DISP(0x89000000, dst_reg, REG_0, imm); + } EMIT_ZERO(dst_reg); break; case BPF_ALU64 | BPF_LSH | BPF_K: /* dst = dst << imm */ @@ -1062,10 +1064,10 @@ static noinline int bpf_jit_insn(struct bpf_jit *jit, struct bpf_prog *fp, EMIT6_DISP_LH(0xeb000000, 0x000c, dst_reg, dst_reg, src_reg, 0); break; case BPF_ALU | BPF_RSH | BPF_K: /* dst = (u32) dst >> (u32) imm */ - if (imm == 0) - break; - /* srl %dst,imm(%r0) */ - EMIT4_DISP(0x88000000, dst_reg, REG_0, imm); + if (imm != 0) { + /* srl %dst,imm(%r0) */ + EMIT4_DISP(0x88000000, dst_reg, REG_0, imm); + } EMIT_ZERO(dst_reg); break; case BPF_ALU64 | BPF_RSH | BPF_K: /* dst = dst >> imm */ @@ -1087,10 +1089,10 @@ static noinline int bpf_jit_insn(struct bpf_jit *jit, struct bpf_prog *fp, EMIT6_DISP_LH(0xeb000000, 0x000a, dst_reg, dst_reg, src_reg, 0); break; case BPF_ALU | BPF_ARSH | BPF_K: /* ((s32) dst >> imm */ - if (imm == 0) - break; - /* sra %dst,imm(%r0) */ - EMIT4_DISP(0x8a000000, dst_reg, REG_0, imm); + if (imm != 0) { + /* sra %dst,imm(%r0) */ + EMIT4_DISP(0x8a000000, dst_reg, REG_0, imm); + } EMIT_ZERO(dst_reg); break; case BPF_ALU64 | BPF_ARSH | BPF_K: /* ((s64) dst) >>= imm */ From dc9660590d106bb58d145233fffca4efadad3655 Mon Sep 17 00:00:00 2001 From: Krzysztof Kozlowski Date: Thu, 16 Sep 2021 16:41:02 +0200 Subject: [PATCH 17/26] regulator: max14577: Revert "regulator: max14577: Add proper module aliases strings" This reverts commit 0da6736ecd10b45e535b100acd58df2db4c099d8. The MODULE_DEVICE_TABLE already creates proper alias. Having another MODULE_ALIAS causes the alias to be duplicated: $ modinfo max14577-regulator.ko alias: platform:max77836-regulator alias: platform:max14577-regulator description: Maxim 14577/77836 regulator driver alias: platform:max77836-regulator alias: platform:max14577-regulator Cc: Marek Szyprowski Fixes: 0da6736ecd10 ("regulator: max14577: Add proper module aliases strings") Signed-off-by: Krzysztof Kozlowski Tested-by: Marek Szyprowski Link: https://lore.kernel.org/r/20210916144102.120980-1-krzysztof.kozlowski@canonical.com Signed-off-by: Mark Brown --- drivers/regulator/max14577-regulator.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/regulator/max14577-regulator.c b/drivers/regulator/max14577-regulator.c index 1d78b455cc48..e34face736f4 100644 --- a/drivers/regulator/max14577-regulator.c +++ b/drivers/regulator/max14577-regulator.c @@ -269,5 +269,3 @@ module_exit(max14577_regulator_exit); MODULE_AUTHOR("Krzysztof Kozlowski "); MODULE_DESCRIPTION("Maxim 14577/77836 regulator driver"); MODULE_LICENSE("GPL"); -MODULE_ALIAS("platform:max14577-regulator"); -MODULE_ALIAS("platform:max77836-regulator"); From a9b3043de47b7f8cbe38c36aee572526665b6315 Mon Sep 17 00:00:00 2001 From: Mike Galbraith Date: Sun, 12 Sep 2021 11:56:26 +0900 Subject: [PATCH 18/26] ksmbd: transport_rdma: Don't include rwlock.h directly rwlock.h specifically asks to not be included directly. In fact, the proper spinlock.h include isn't needed either, it comes with the huge pile that kthread.h ends up pulling in, so just drop it entirely. Signed-off-by: Mike Galbraith Signed-off-by: Namjae Jeon Signed-off-by: Steve French --- fs/ksmbd/transport_rdma.c | 1 - 1 file changed, 1 deletion(-) diff --git a/fs/ksmbd/transport_rdma.c b/fs/ksmbd/transport_rdma.c index 52b2556e76b1..3a7fa23ba850 100644 --- a/fs/ksmbd/transport_rdma.c +++ b/fs/ksmbd/transport_rdma.c @@ -20,7 +20,6 @@ #define SUBMOD_NAME "smb_direct" #include -#include #include #include #include From e3fc065682ebbbd15b0ce0036800f4acbf765d46 Mon Sep 17 00:00:00 2001 From: Rohith Surabattula Date: Fri, 17 Sep 2021 18:14:26 +0000 Subject: [PATCH 19/26] cifs: Deferred close performance improvements During unlink/rename instead of closing all the deferred handles under tcon, close only handles under the requested dentry. Signed-off-by: Rohith Surabattula Signed-off-by: Steve French --- fs/cifs/cifsproto.h | 3 +++ fs/cifs/inode.c | 6 +++--- fs/cifs/misc.c | 37 +++++++++++++++++++++++++++++++++++++ 3 files changed, 43 insertions(+), 3 deletions(-) diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h index 54966c1a8eb6..d0f85b666662 100644 --- a/fs/cifs/cifsproto.h +++ b/fs/cifs/cifsproto.h @@ -267,6 +267,9 @@ extern void cifs_close_deferred_file(struct cifsInodeInfo *cifs_inode); extern void cifs_close_all_deferred_files(struct cifs_tcon *cifs_tcon); +extern void cifs_close_deferred_file_under_dentry(struct cifs_tcon *cifs_tcon, + const char *path); + extern struct TCP_Server_Info *cifs_get_tcp_session(struct smb3_fs_context *ctx); extern void cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect); diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c index 19af2d0ec8d5..82848412ad85 100644 --- a/fs/cifs/inode.c +++ b/fs/cifs/inode.c @@ -1624,7 +1624,7 @@ int cifs_unlink(struct inode *dir, struct dentry *dentry) goto unlink_out; } - cifs_close_deferred_file(CIFS_I(inode)); + cifs_close_deferred_file_under_dentry(tcon, full_path); if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability))) { rc = CIFSPOSIXDelFile(xid, tcon, full_path, @@ -2113,9 +2113,9 @@ cifs_rename2(struct user_namespace *mnt_userns, struct inode *source_dir, goto cifs_rename_exit; } - cifs_close_deferred_file(CIFS_I(d_inode(source_dentry))); + cifs_close_deferred_file_under_dentry(tcon, from_name); if (d_inode(target_dentry) != NULL) - cifs_close_deferred_file(CIFS_I(d_inode(target_dentry))); + cifs_close_deferred_file_under_dentry(tcon, to_name); rc = cifs_do_rename(xid, source_dentry, from_name, target_dentry, to_name); diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c index f4313935e734..05138f92d905 100644 --- a/fs/cifs/misc.c +++ b/fs/cifs/misc.c @@ -780,6 +780,43 @@ cifs_close_all_deferred_files(struct cifs_tcon *tcon) kfree(tmp_list); } } +void +cifs_close_deferred_file_under_dentry(struct cifs_tcon *tcon, const char *path) +{ + struct cifsFileInfo *cfile; + struct list_head *tmp; + struct file_list *tmp_list, *tmp_next_list; + struct list_head file_head; + void *page; + const char *full_path; + + INIT_LIST_HEAD(&file_head); + page = alloc_dentry_path(); + spin_lock(&tcon->open_file_lock); + list_for_each(tmp, &tcon->openFileList) { + cfile = list_entry(tmp, struct cifsFileInfo, tlist); + full_path = build_path_from_dentry(cfile->dentry, page); + if (strstr(full_path, path)) { + if (delayed_work_pending(&cfile->deferred)) { + if (cancel_delayed_work(&cfile->deferred)) { + tmp_list = kmalloc(sizeof(struct file_list), GFP_ATOMIC); + if (tmp_list == NULL) + break; + tmp_list->cfile = cfile; + list_add_tail(&tmp_list->list, &file_head); + } + } + } + } + spin_unlock(&tcon->open_file_lock); + + list_for_each_entry_safe(tmp_list, tmp_next_list, &file_head, list) { + _cifsFileInfo_put(tmp_list->cfile, true, false); + list_del(&tmp_list->list); + kfree(tmp_list); + } + free_dentry_path(page); +} /* parses DFS refferal V3 structure * caller is responsible for freeing target_nodes From 71826b068884050d5fdd37fda857ba1539c513d3 Mon Sep 17 00:00:00 2001 From: Rohith Surabattula Date: Fri, 17 Sep 2021 17:29:42 +0000 Subject: [PATCH 20/26] cifs: Fix soft lockup during fsstress Below traces are observed during fsstress and system got hung. [ 130.698396] watchdog: BUG: soft lockup - CPU#6 stuck for 26s! Cc: stable@vger.kernel.org # 5.13+ Signed-off-by: Rohith Surabattula Signed-off-by: Steve French --- fs/cifs/misc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c index 05138f92d905..03da00eb7c04 100644 --- a/fs/cifs/misc.c +++ b/fs/cifs/misc.c @@ -735,7 +735,7 @@ cifs_close_deferred_file(struct cifsInodeInfo *cifs_inode) if (cancel_delayed_work(&cfile->deferred)) { tmp_list = kmalloc(sizeof(struct file_list), GFP_ATOMIC); if (tmp_list == NULL) - continue; + break; tmp_list->cfile = cfile; list_add_tail(&tmp_list->list, &file_head); } @@ -766,7 +766,7 @@ cifs_close_all_deferred_files(struct cifs_tcon *tcon) if (cancel_delayed_work(&cfile->deferred)) { tmp_list = kmalloc(sizeof(struct file_list), GFP_ATOMIC); if (tmp_list == NULL) - continue; + break; tmp_list->cfile = cfile; list_add_tail(&tmp_list->list, &file_head); } From 35866f3f779aef5e7ba84e4d1023fe2e2a0e219e Mon Sep 17 00:00:00 2001 From: Rohith Surabattula Date: Fri, 17 Sep 2021 16:50:40 -0500 Subject: [PATCH 21/26] cifs: Not to defer close on file when lock is set Close file immediately when lock is set. Cc: stable@vger.kernel.org # 5.13+ Signed-off-by: Rohith Surabattula Signed-off-by: Steve French --- fs/cifs/cifsglob.h | 1 + fs/cifs/file.c | 2 ++ 2 files changed, 3 insertions(+) diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h index 7dd9878e26bf..e916470468ea 100644 --- a/fs/cifs/cifsglob.h +++ b/fs/cifs/cifsglob.h @@ -1399,6 +1399,7 @@ struct cifsInodeInfo { #define CIFS_INO_INVALID_MAPPING (4) /* pagecache is invalid */ #define CIFS_INO_LOCK (5) /* lock bit for synchronization */ #define CIFS_INO_MODIFIED_ATTR (6) /* Indicate change in mtime/ctime */ +#define CIFS_INO_CLOSE_ON_LOCK (7) /* Not to defer the close when lock is set */ unsigned long flags; spinlock_t writers_lock; unsigned int writers; /* Number of writers on this inode */ diff --git a/fs/cifs/file.c b/fs/cifs/file.c index 4d10c9343890..6796fc73b304 100644 --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -882,6 +882,7 @@ int cifs_close(struct inode *inode, struct file *file) dclose = kmalloc(sizeof(struct cifs_deferred_close), GFP_KERNEL); if ((cinode->oplock == CIFS_CACHE_RHW_FLG) && cinode->lease_granted && + !test_bit(CIFS_INO_CLOSE_ON_LOCK, &cinode->flags) && dclose) { if (test_bit(CIFS_INO_MODIFIED_ATTR, &cinode->flags)) { inode->i_ctime = inode->i_mtime = current_time(inode); @@ -1864,6 +1865,7 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *flock) cifs_read_flock(flock, &type, &lock, &unlock, &wait_flag, tcon->ses->server); cifs_sb = CIFS_FILE_SB(file); + set_bit(CIFS_INO_CLOSE_ON_LOCK, &CIFS_I(d_inode(cfile->dentry))->flags); if (cap_unix(tcon->ses) && (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && From f58eae6c5fa882d6d0a6b7587a099602a59d57b5 Mon Sep 17 00:00:00 2001 From: Hyunchul Lee Date: Fri, 17 Sep 2021 22:14:08 +0900 Subject: [PATCH 22/26] ksmbd: prevent out of share access Because of .., files outside the share directory could be accessed. To prevent this, normalize the given path and remove all . and .. components. In addition to the usual large set of regression tests (smbtorture and xfstests), ran various tests on this to specifically check path name validation including libsmb2 tests to verify path normalization: ./examples/smb2-ls-async smb://172.30.1.15/homes2/../ ./examples/smb2-ls-async smb://172.30.1.15/homes2/foo/../ ./examples/smb2-ls-async smb://172.30.1.15/homes2/foo/../../ ./examples/smb2-ls-async smb://172.30.1.15/homes2/foo/../ ./examples/smb2-ls-async smb://172.30.1.15/homes2/foo/..bar/ ./examples/smb2-ls-async smb://172.30.1.15/homes2/foo/bar../ ./examples/smb2-ls-async smb://172.30.1.15/homes2/foo/bar.. ./examples/smb2-ls-async smb://172.30.1.15/homes2/foo/bar../../../../ Signed-off-by: Hyunchul Lee Signed-off-by: Namjae Jeon Signed-off-by: Steve French --- fs/ksmbd/misc.c | 76 ++++++++++++++++++++++++++++++++++++++++------ fs/ksmbd/misc.h | 3 +- fs/ksmbd/smb2pdu.c | 14 ++++++--- 3 files changed, 77 insertions(+), 16 deletions(-) diff --git a/fs/ksmbd/misc.c b/fs/ksmbd/misc.c index 0b307ca28a19..3eac3c01749f 100644 --- a/fs/ksmbd/misc.c +++ b/fs/ksmbd/misc.c @@ -191,19 +191,77 @@ int get_nlink(struct kstat *st) return nlink; } -void ksmbd_conv_path_to_unix(char *path) +char *ksmbd_conv_path_to_unix(char *path) { + size_t path_len, remain_path_len, out_path_len; + char *out_path, *out_next; + int i, pre_dotdot_cnt = 0, slash_cnt = 0; + bool is_last; + strreplace(path, '\\', '/'); -} + path_len = strlen(path); + remain_path_len = path_len; + if (path_len == 0) + return ERR_PTR(-EINVAL); -void ksmbd_strip_last_slash(char *path) -{ - int len = strlen(path); + out_path = kzalloc(path_len + 2, GFP_KERNEL); + if (!out_path) + return ERR_PTR(-ENOMEM); + out_path_len = 0; + out_next = out_path; - while (len && path[len - 1] == '/') { - path[len - 1] = '\0'; - len--; - } + do { + char *name = path + path_len - remain_path_len; + char *next = strchrnul(name, '/'); + size_t name_len = next - name; + + is_last = !next[0]; + if (name_len == 2 && name[0] == '.' && name[1] == '.') { + pre_dotdot_cnt++; + /* handle the case that path ends with "/.." */ + if (is_last) + goto follow_dotdot; + } else { + if (pre_dotdot_cnt) { +follow_dotdot: + slash_cnt = 0; + for (i = out_path_len - 1; i >= 0; i--) { + if (out_path[i] == '/' && + ++slash_cnt == pre_dotdot_cnt + 1) + break; + } + + if (i < 0 && + slash_cnt != pre_dotdot_cnt) { + kfree(out_path); + return ERR_PTR(-EINVAL); + } + + out_next = &out_path[i+1]; + *out_next = '\0'; + out_path_len = i + 1; + + } + + if (name_len != 0 && + !(name_len == 1 && name[0] == '.') && + !(name_len == 2 && name[0] == '.' && name[1] == '.')) { + next[0] = '\0'; + sprintf(out_next, "%s/", name); + out_next += name_len + 1; + out_path_len += name_len + 1; + next[0] = '/'; + } + pre_dotdot_cnt = 0; + } + + remain_path_len -= name_len + 1; + } while (!is_last); + + if (out_path_len > 0) + out_path[out_path_len-1] = '\0'; + path[path_len] = '\0'; + return out_path; } void ksmbd_conv_path_to_windows(char *path) diff --git a/fs/ksmbd/misc.h b/fs/ksmbd/misc.h index af8717d4d85b..b7b10139ada2 100644 --- a/fs/ksmbd/misc.h +++ b/fs/ksmbd/misc.h @@ -16,8 +16,7 @@ int ksmbd_validate_filename(char *filename); int parse_stream_name(char *filename, char **stream_name, int *s_type); char *convert_to_nt_pathname(char *filename, char *sharepath); int get_nlink(struct kstat *st); -void ksmbd_conv_path_to_unix(char *path); -void ksmbd_strip_last_slash(char *path); +char *ksmbd_conv_path_to_unix(char *path); void ksmbd_conv_path_to_windows(char *path); char *ksmbd_extract_sharename(char *treename); char *convert_to_unix_name(struct ksmbd_share_config *share, char *name); diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c index c86164dc70bb..46e0275a77a8 100644 --- a/fs/ksmbd/smb2pdu.c +++ b/fs/ksmbd/smb2pdu.c @@ -634,7 +634,7 @@ static char * smb2_get_name(struct ksmbd_share_config *share, const char *src, const int maxlen, struct nls_table *local_nls) { - char *name, *unixname; + char *name, *norm_name, *unixname; name = smb_strndup_from_utf16(src, maxlen, 1, local_nls); if (IS_ERR(name)) { @@ -643,11 +643,15 @@ smb2_get_name(struct ksmbd_share_config *share, const char *src, } /* change it to absolute unix name */ - ksmbd_conv_path_to_unix(name); - ksmbd_strip_last_slash(name); - - unixname = convert_to_unix_name(share, name); + norm_name = ksmbd_conv_path_to_unix(name); + if (IS_ERR(norm_name)) { + kfree(name); + return norm_name; + } kfree(name); + + unixname = convert_to_unix_name(share, norm_name); + kfree(norm_name); if (!unixname) { pr_err("can not convert absolute name\n"); return ERR_PTR(-ENOMEM); From 6d56262c3d224699b29b9bb6b4ace8bab7d692c2 Mon Sep 17 00:00:00 2001 From: Namjae Jeon Date: Sat, 18 Sep 2021 18:45:12 +0900 Subject: [PATCH 23/26] ksmbd: add validation for FILE_FULL_EA_INFORMATION of smb2_get_info MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add validation to check whether req->InputBufferLength is smaller than smb2_ea_info_req structure size. Cc: Ronnie Sahlberg Cc: Ralph Böhme Cc: Steve French Signed-off-by: Namjae Jeon Signed-off-by: Steve French --- fs/ksmbd/smb2pdu.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c index 46e0275a77a8..6304c9bda479 100644 --- a/fs/ksmbd/smb2pdu.c +++ b/fs/ksmbd/smb2pdu.c @@ -4045,6 +4045,10 @@ static int smb2_get_ea(struct ksmbd_work *work, struct ksmbd_file *fp, path = &fp->filp->f_path; /* single EA entry is requested with given user.* name */ if (req->InputBufferLength) { + if (le32_to_cpu(req->InputBufferLength) < + sizeof(struct smb2_ea_info_req)) + return -EINVAL; + ea_req = (struct smb2_ea_info_req *)req->Buffer; } else { /* need to send all EAs, if no specific EA is requested*/ From d8b1e10a2b8efaf71d151aa756052fbf2f3b6d57 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Mon, 20 Sep 2021 10:56:32 -0700 Subject: [PATCH 24/26] sparc64: fix pci_iounmap() when CONFIG_PCI is not set Guenter reported [1] that the pci_iounmap() changes remain problematic, with sparc64 allnoconfig and tinyconfig still not building due to the header file changes and confusion with the arch-specific pci_iounmap() implementation. I'm pretty convinced that sparc should just use GENERIC_IOMAP instead of doing its own thing, since it turns out that the sparc64 version of pci_iounmap() is somewhat buggy (see [2]). But in the meantime, this just fixes the build by avoiding the trivial re-definition of the empty case. Link: https://lore.kernel.org/lkml/20210920134424.GA346531@roeck-us.net/ [1] Link: https://lore.kernel.org/lkml/CAHk-=wgheheFx9myQyy5osh79BAazvmvYURAtub2gQtMvLrhqQ@mail.gmail.com/ [2] Reported-by: Guenter Roeck Cc: David Miller Signed-off-by: Linus Torvalds --- arch/sparc/lib/iomap.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/sparc/lib/iomap.c b/arch/sparc/lib/iomap.c index c9da9f139694..f3a8cd491ce0 100644 --- a/arch/sparc/lib/iomap.c +++ b/arch/sparc/lib/iomap.c @@ -19,8 +19,10 @@ void ioport_unmap(void __iomem *addr) EXPORT_SYMBOL(ioport_map); EXPORT_SYMBOL(ioport_unmap); +#ifdef CONFIG_PCI void pci_iounmap(struct pci_dev *dev, void __iomem * addr) { /* nothing to do */ } EXPORT_SYMBOL(pci_iounmap); +#endif From e8f71f89236ef82d449991bfbc237e3cb6ea584f Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Wed, 8 Sep 2021 12:08:17 -0700 Subject: [PATCH 25/26] drm/nouveau/nvkm: Replace -ENOSYS with -ENODEV nvkm test builds fail with the following error. drivers/gpu/drm/nouveau/nvkm/engine/device/ctrl.c: In function 'nvkm_control_mthd_pstate_info': drivers/gpu/drm/nouveau/nvkm/engine/device/ctrl.c:60:35: error: overflow in conversion from 'int' to '__s8' {aka 'signed char'} changes value from '-251' to '5' The code builds on most architectures, but fails on parisc where ENOSYS is defined as 251. Replace the error code with -ENODEV (-19). The actual error code does not really matter and is not passed to userspace - it just has to be negative. Fixes: 7238eca4cf18 ("drm/nouveau: expose pstate selection per-power source in sysfs") Signed-off-by: Guenter Roeck Cc: Ben Skeggs Cc: David Airlie Cc: Daniel Vetter Signed-off-by: Linus Torvalds --- drivers/gpu/drm/nouveau/nvkm/engine/device/ctrl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/device/ctrl.c b/drivers/gpu/drm/nouveau/nvkm/engine/device/ctrl.c index b0ece71aefde..ce774579c89d 100644 --- a/drivers/gpu/drm/nouveau/nvkm/engine/device/ctrl.c +++ b/drivers/gpu/drm/nouveau/nvkm/engine/device/ctrl.c @@ -57,7 +57,7 @@ nvkm_control_mthd_pstate_info(struct nvkm_control *ctrl, void *data, u32 size) args->v0.count = 0; args->v0.ustate_ac = NVIF_CONTROL_PSTATE_INFO_V0_USTATE_DISABLE; args->v0.ustate_dc = NVIF_CONTROL_PSTATE_INFO_V0_USTATE_DISABLE; - args->v0.pwrsrc = -ENOSYS; + args->v0.pwrsrc = -ENODEV; args->v0.pstate = NVIF_CONTROL_PSTATE_INFO_V0_PSTATE_UNKNOWN; } From d5f6545934c47e97c0b48a645418e877b452a992 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Mon, 20 Sep 2021 10:26:21 -0700 Subject: [PATCH 26/26] qnx4: work around gcc false positive warning bug In commit b7213ffa0e58 ("qnx4: avoid stringop-overread errors") I tried to teach gcc about how the directory entry structure can be two different things depending on a status flag. It made the code clearer, and it seemed to make gcc happy. However, Arnd points to a gcc bug, where despite using two different members of a union, gcc then gets confused, and uses the size of one of the members to decide if a string overrun happens. And not necessarily the rigth one. End result: with some configurations, gcc-11 will still complain about the source buffer size being overread: fs/qnx4/dir.c: In function 'qnx4_readdir': fs/qnx4/dir.c:76:32: error: 'strnlen' specified bound [16, 48] exceeds source size 1 [-Werror=stringop-overread] 76 | size = strnlen(name, size); | ^~~~~~~~~~~~~~~~~~~ fs/qnx4/dir.c:26:22: note: source object declared here 26 | char de_name; | ^~~~~~~ because gcc will get confused about which union member entry is actually getting accessed, even when the source code is very clear about it. Gcc internally will have combined two "redundant" pointers (pointing to different union elements that are at the same offset), and takes the size checking from one or the other - not necessarily the right one. This is clearly a gcc bug, but we can work around it fairly easily. The biggest thing here is the big honking comment about why we do what we do. Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99578#c6 Reported-and-tested-by: Arnd Bergmann Signed-off-by: Linus Torvalds --- fs/qnx4/dir.c | 36 +++++++++++++++++++++++++++--------- 1 file changed, 27 insertions(+), 9 deletions(-) diff --git a/fs/qnx4/dir.c b/fs/qnx4/dir.c index 2a66844b7ff8..66645a5a35f3 100644 --- a/fs/qnx4/dir.c +++ b/fs/qnx4/dir.c @@ -20,12 +20,33 @@ * depending on the status field in the last byte. The * first byte is where the name start either way, and a * zero means it's empty. + * + * Also, due to a bug in gcc, we don't want to use the + * real (differently sized) name arrays in the inode and + * link entries, but always the 'de_name[]' one in the + * fake struct entry. + * + * See + * + * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99578#c6 + * + * for details, but basically gcc will take the size of the + * 'name' array from one of the used union entries randomly. + * + * This use of 'de_name[]' (48 bytes) avoids the false positive + * warnings that would happen if gcc decides to use 'inode.di_name' + * (16 bytes) even when the pointer and size were to come from + * 'link.dl_name' (48 bytes). + * + * In all cases the actual name pointer itself is the same, it's + * only the gcc internal 'what is the size of this field' logic + * that can get confused. */ union qnx4_directory_entry { struct { - char de_name; - char de_pad[62]; - char de_status; + const char de_name[48]; + u8 de_pad[15]; + u8 de_status; }; struct qnx4_inode_entry inode; struct qnx4_link_info link; @@ -53,29 +74,26 @@ static int qnx4_readdir(struct file *file, struct dir_context *ctx) ix = (ctx->pos >> QNX4_DIR_ENTRY_SIZE_BITS) % QNX4_INODES_PER_BLOCK; for (; ix < QNX4_INODES_PER_BLOCK; ix++, ctx->pos += QNX4_DIR_ENTRY_SIZE) { union qnx4_directory_entry *de; - const char *name; offset = ix * QNX4_DIR_ENTRY_SIZE; de = (union qnx4_directory_entry *) (bh->b_data + offset); - if (!de->de_name) + if (!de->de_name[0]) continue; if (!(de->de_status & (QNX4_FILE_USED|QNX4_FILE_LINK))) continue; if (!(de->de_status & QNX4_FILE_LINK)) { size = sizeof(de->inode.di_fname); - name = de->inode.di_fname; ino = blknum * QNX4_INODES_PER_BLOCK + ix - 1; } else { size = sizeof(de->link.dl_fname); - name = de->link.dl_fname; ino = ( le32_to_cpu(de->link.dl_inode_blk) - 1 ) * QNX4_INODES_PER_BLOCK + de->link.dl_inode_ndx; } - size = strnlen(name, size); + size = strnlen(de->de_name, size); QNX4DEBUG((KERN_INFO "qnx4_readdir:%.*s\n", size, name)); - if (!dir_emit(ctx, name, size, ino, DT_UNKNOWN)) { + if (!dir_emit(ctx, de->de_name, size, ino, DT_UNKNOWN)) { brelse(bh); return 0; }