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xfs: fix perag leak when growfs fails

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[ Upstream commit 7823921887750b39d02e6b44faafdd1cc617c651 ]

[ 6.1: resolved conflicts in xfs_ag.c and xfs_ag.h ]

During growfs, if new ag in memory has been initialized, however
sb_agcount has not been updated, if an error occurs at this time it
will cause perag leaks as follows, these new AGs will not been freed
during umount , because of these new AGs are not visible(that is
included in mp->m_sb.sb_agcount).

unreferenced object 0xffff88810be40200 (size 512):
  comm "xfs_growfs", pid 857, jiffies 4294909093
  hex dump (first 32 bytes):
    00 c0 c1 05 81 88 ff ff 04 00 00 00 00 00 00 00  ................
    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace (crc 381741e2):
    [<ffffffff8191aef6>] __kmalloc+0x386/0x4f0
    [<ffffffff82553e65>] kmem_alloc+0xb5/0x2f0
    [<ffffffff8238dac5>] xfs_initialize_perag+0xc5/0x810
    [<ffffffff824f679c>] xfs_growfs_data+0x9bc/0xbc0
    [<ffffffff8250b90e>] xfs_file_ioctl+0x5fe/0x14d0
    [<ffffffff81aa5194>] __x64_sys_ioctl+0x144/0x1c0
    [<ffffffff83c3d81f>] do_syscall_64+0x3f/0xe0
    [<ffffffff83e00087>] entry_SYSCALL_64_after_hwframe+0x62/0x6a
unreferenced object 0xffff88810be40800 (size 512):
  comm "xfs_growfs", pid 857, jiffies 4294909093
  hex dump (first 32 bytes):
    20 00 00 00 00 00 00 00 57 ef be dc 00 00 00 00   .......W.......
    10 08 e4 0b 81 88 ff ff 10 08 e4 0b 81 88 ff ff  ................
  backtrace (crc bde50e2d):
    [<ffffffff8191b43a>] __kmalloc_node+0x3da/0x540
    [<ffffffff81814489>] kvmalloc_node+0x99/0x160
    [<ffffffff8286acff>] bucket_table_alloc.isra.0+0x5f/0x400
    [<ffffffff8286bdc5>] rhashtable_init+0x405/0x760
    [<ffffffff8238dda3>] xfs_initialize_perag+0x3a3/0x810
    [<ffffffff824f679c>] xfs_growfs_data+0x9bc/0xbc0
    [<ffffffff8250b90e>] xfs_file_ioctl+0x5fe/0x14d0
    [<ffffffff81aa5194>] __x64_sys_ioctl+0x144/0x1c0
    [<ffffffff83c3d81f>] do_syscall_64+0x3f/0xe0
    [<ffffffff83e00087>] entry_SYSCALL_64_after_hwframe+0x62/0x6a

Factor out xfs_free_unused_perag_range() from xfs_initialize_perag(),
used for freeing unused perag within a specified range in error handling,
included in the error path of the growfs failure.

Fixes: 1c1c6ebcf5 ("xfs: Replace per-ag array with a radix tree")
Signed-off-by: Long Li <leo.lilong@huawei.com>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>
Signed-off-by: Catherine Hoang <catherine.hoang@oracle.com>
Acked-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Leah Rumancik <leah.rumancik@gmail.com>
Acked-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Long Li
2025-03-13 13:25:45 -07:00
committed by Greg Kroah-Hartman
parent 4f4e046caa
commit 6c20890ebf
3 changed files with 32 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
fs/xfs/libxfs/xfs_ag.c
View File

@@ -259,6 +259,30 @@ xfs_agino_range(
return __xfs_agino_range(mp, xfs_ag_block_count(mp, agno), first, last);
}
/*
* Free perag within the specified AG range, it is only used to free unused
* perags under the error handling path.
*/
void
xfs_free_unused_perag_range(
struct xfs_mount *mp,
xfs_agnumber_t agstart,
xfs_agnumber_t agend)
{
struct xfs_perag *pag;
xfs_agnumber_t index;
for (index = agstart; index < agend; index++) {
spin_lock(&mp->m_perag_lock);
pag = radix_tree_delete(&mp->m_perag_tree, index);
spin_unlock(&mp->m_perag_lock);
if (!pag)
break;
xfs_buf_hash_destroy(pag);
kmem_free(pag);
}
}
int
xfs_initialize_perag(
struct xfs_mount *mp,
@@ -352,15 +376,7 @@ out_free_pag:
kmem_free(pag);
out_unwind_new_pags:
/* unwind any prior newly initialized pags */
for (index = first_initialised; index < agcount; index++) {
spin_lock(&mp->m_perag_lock);
pag = radix_tree_delete(&mp->m_perag_tree, index);
spin_unlock(&mp->m_perag_lock);
if (!pag)
break;
xfs_buf_hash_destroy(pag);
kmem_free(pag);
}
xfs_free_unused_perag_range(mp, first_initialised, agcount);
return error;
}

3
fs/xfs/libxfs/xfs_ag.h
View File

@@ -106,6 +106,9 @@ struct xfs_perag {
#endif /* __KERNEL__ */
};
void xfs_free_unused_perag_range(struct xfs_mount *mp, xfs_agnumber_t agstart,
xfs_agnumber_t agend);
int xfs_initialize_perag(struct xfs_mount *mp, xfs_agnumber_t agcount,
xfs_rfsblock_t dcount, xfs_agnumber_t *maxagi);
int xfs_initialize_perag_data(struct xfs_mount *mp, xfs_agnumber_t agno);

5
fs/xfs/xfs_fsops.c
View File

@@ -153,7 +153,7 @@ xfs_growfs_data_private(
(delta > 0 ? XFS_GROWFS_SPACE_RES(mp) : -delta), 0,
XFS_TRANS_RESERVE, &tp);
if (error)
return error;
goto out_free_unused_perag;
last_pag = xfs_perag_get(mp, oagcount - 1);
if (delta > 0) {
@@ -227,6 +227,9 @@ xfs_growfs_data_private(
out_trans_cancel:
xfs_trans_cancel(tp);
out_free_unused_perag:
if (nagcount > oagcount)
xfs_free_unused_perag_range(mp, oagcount, nagcount);
return error;
}