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authorDave Chinner <dchinner@redhat.com>2010-07-20 17:53:59 +1000
committerAlex Elder <aelder@sgi.com>2010-07-26 13:16:49 -0500
commit4a7edddcb5b14ddb5962e6906b6fd6b500d7a361 (patch)
treee62253cc40f36bfa631f0dd316a16ac987d11dd4 /fs/xfs
parent438697064aaa2f64e0fcc6586582a3e7ec36005b (diff)
xfs: fix memory reclaim recursion deadlock on locked inode buffer
Calling into memory reclaim with a locked inode buffer can deadlock if memory reclaim tries to lock the inode buffer during inode teardown. Convert the relevant memory allocations to use KM_NOFS to avoid this deadlock condition. Reported-by: Peter Watkins <treestem@gmail.com> Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Alex Elder <aelder@sgi.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/xfs_inode.c20
1 files changed, 11 insertions, 9 deletions
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 5715a9d8bcd6..4a08c91dc976 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -422,7 +422,7 @@ xfs_iformat(
if (!XFS_DFORK_Q(dip))
return 0;
ASSERT(ip->i_afp == NULL);
- ip->i_afp = kmem_zone_zalloc(xfs_ifork_zone, KM_SLEEP);
+ ip->i_afp = kmem_zone_zalloc(xfs_ifork_zone, KM_SLEEP | KM_NOFS);
ip->i_afp->if_ext_max =
XFS_IFORK_ASIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
switch (dip->di_aformat) {
@@ -505,7 +505,7 @@ xfs_iformat_local(
ifp->if_u1.if_data = ifp->if_u2.if_inline_data;
else {
real_size = roundup(size, 4);
- ifp->if_u1.if_data = kmem_alloc(real_size, KM_SLEEP);
+ ifp->if_u1.if_data = kmem_alloc(real_size, KM_SLEEP | KM_NOFS);
}
ifp->if_bytes = size;
ifp->if_real_bytes = real_size;
@@ -632,7 +632,7 @@ xfs_iformat_btree(
}
ifp->if_broot_bytes = size;
- ifp->if_broot = kmem_alloc(size, KM_SLEEP);
+ ifp->if_broot = kmem_alloc(size, KM_SLEEP | KM_NOFS);
ASSERT(ifp->if_broot != NULL);
/*
* Copy and convert from the on-disk structure
@@ -2191,7 +2191,7 @@ xfs_iroot_realloc(
*/
if (ifp->if_broot_bytes == 0) {
new_size = (size_t)XFS_BMAP_BROOT_SPACE_CALC(rec_diff);
- ifp->if_broot = kmem_alloc(new_size, KM_SLEEP);
+ ifp->if_broot = kmem_alloc(new_size, KM_SLEEP | KM_NOFS);
ifp->if_broot_bytes = (int)new_size;
return;
}
@@ -2207,7 +2207,7 @@ xfs_iroot_realloc(
new_size = (size_t)XFS_BMAP_BROOT_SPACE_CALC(new_max);
ifp->if_broot = kmem_realloc(ifp->if_broot, new_size,
(size_t)XFS_BMAP_BROOT_SPACE_CALC(cur_max), /* old size */
- KM_SLEEP);
+ KM_SLEEP | KM_NOFS);
op = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, ifp->if_broot, 1,
ifp->if_broot_bytes);
np = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, ifp->if_broot, 1,
@@ -2233,7 +2233,7 @@ xfs_iroot_realloc(
else
new_size = 0;
if (new_size > 0) {
- new_broot = kmem_alloc(new_size, KM_SLEEP);
+ new_broot = kmem_alloc(new_size, KM_SLEEP | KM_NOFS);
/*
* First copy over the btree block header.
*/
@@ -2337,7 +2337,8 @@ xfs_idata_realloc(
real_size = roundup(new_size, 4);
if (ifp->if_u1.if_data == NULL) {
ASSERT(ifp->if_real_bytes == 0);
- ifp->if_u1.if_data = kmem_alloc(real_size, KM_SLEEP);
+ ifp->if_u1.if_data = kmem_alloc(real_size,
+ KM_SLEEP | KM_NOFS);
} else if (ifp->if_u1.if_data != ifp->if_u2.if_inline_data) {
/*
* Only do the realloc if the underlying size
@@ -2348,11 +2349,12 @@ xfs_idata_realloc(
kmem_realloc(ifp->if_u1.if_data,
real_size,
ifp->if_real_bytes,
- KM_SLEEP);
+ KM_SLEEP | KM_NOFS);
}
} else {
ASSERT(ifp->if_real_bytes == 0);
- ifp->if_u1.if_data = kmem_alloc(real_size, KM_SLEEP);
+ ifp->if_u1.if_data = kmem_alloc(real_size,
+ KM_SLEEP | KM_NOFS);
memcpy(ifp->if_u1.if_data, ifp->if_u2.if_inline_data,
ifp->if_bytes);
}