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xfs: kill XBF_DONTBLOCK

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Just about all callers of xfs_buf_read() and xfs_buf_get() use XBF_DONTBLOCK.
This is used to make memory allocation use GFP_NOFS rather than GFP_KERNEL to
avoid recursion through memory reclaim back into the filesystem.

All the blocking get calls in growfs occur inside a transaction, even though
they are no part of the transaction, so all allocation will be GFP_NOFS due to
the task flag PF_TRANS being set. The blocking read calls occur during log
recovery, so they will probably be unaffected by converting to GFP_NOFS
allocations.

Hence make XBF_DONTBLOCK behaviour always occur for buffers and kill the flag.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Dave Chinner 2012-04-23 15:58:56 +10:00 • committed by Ben Myers
parent 7ca790a507
commit aa5c158ec9
5 changed files with 14 additions and 38 deletions
Download patch file Download diff file Expand all files Collapse all files

25
fs/xfs/xfs_trans_buf.c
View file

@ -148,8 +148,7 @@ xfs_trans_get_buf(xfs_trans_t *tp,
* Default to a normal get_buf() call if the tp is NULL.
*/
if (tp == NULL)
return xfs_buf_get(target_dev, blkno, len,
flags | XBF_DONT_BLOCK);
return xfs_buf_get(target_dev, blkno, len, flags);
/*
* If we find the buffer in the cache with this transaction
@ -174,15 +173,7 @@ xfs_trans_get_buf(xfs_trans_t *tp,
return (bp);
}
/*
* We always specify the XBF_DONT_BLOCK flag within a transaction
* so that get_buf does not try to push out a delayed write buffer
* which might cause another transaction to take place (if the
* buffer was delayed alloc). Such recursive transactions can
* easily deadlock with our current transaction as well as cause
* us to run out of stack space.
*/
bp = xfs_buf_get(target_dev, blkno, len, flags | XBF_DONT_BLOCK);
bp = xfs_buf_get(target_dev, blkno, len, flags);
if (bp == NULL) {
return NULL;
}
@ -283,7 +274,7 @@ xfs_trans_read_buf(
* Default to a normal get_buf() call if the tp is NULL.
*/
if (tp == NULL) {
bp = xfs_buf_read(target, blkno, len, flags | XBF_DONT_BLOCK);
bp = xfs_buf_read(target, blkno, len, flags);
if (!bp)
return (flags & XBF_TRYLOCK) ?
EAGAIN : XFS_ERROR(ENOMEM);
@ -367,15 +358,7 @@ xfs_trans_read_buf(
return 0;
}
/*
* We always specify the XBF_DONT_BLOCK flag within a transaction
* so that get_buf does not try to push out a delayed write buffer
* which might cause another transaction to take place (if the
* buffer was delayed alloc). Such recursive transactions can
* easily deadlock with our current transaction as well as cause
* us to run out of stack space.
*/
bp = xfs_buf_read(target, blkno, len, flags | XBF_DONT_BLOCK);
bp = xfs_buf_read(target, blkno, len, flags);
if (bp == NULL) {
*bpp = NULL;
return (flags & XBF_TRYLOCK) ?