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[XFS] fix error inversion problems with data flushing

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XFS gets the sign of the error wrong in several places when
gathering the error from generic linux functions. These functions
return negative error values, while the core XFS code returns
positive error values. Hence when XFS inverts the error to be
returned to the VFS, it can incorrectly invert a negative
error and this error will be ignored by the syscall return.

Fix all the problems related to calling filemap_* functions.

Problem initially identified by Nick Piggin in xfs_fsync().

Signed-off-by: Dave Chinner <david@fromorbit.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Niv Sardi <xaiki@sgi.com>
This commit is contained in:
Dave Chinner 2008-11-28 14:23:33 +11:00 committed by Niv Sardi
parent 65795910c1
commit 2e6560929d
5 changed files with 32 additions and 9 deletions
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23
fs/xfs/linux-2.6/xfs_fs_subr.c
View File

@ -24,6 +24,10 @@ int fs_noerr(void) { return 0; }
int fs_nosys(void) { return ENOSYS; }
void fs_noval(void) { return; }
/*
* note: all filemap functions return negative error codes. These
* need to be inverted before returning to the xfs core functions.
*/
void
xfs_tosspages(
xfs_inode_t *ip,
@ -53,7 +57,7 @@ xfs_flushinval_pages(
if (!ret)
truncate_inode_pages(mapping, first);
}
return ret;
return -ret;
}
int
@ -72,10 +76,23 @@ xfs_flush_pages(
xfs_iflags_clear(ip, XFS_ITRUNCATED);
ret = filemap_fdatawrite(mapping);
if (flags & XFS_B_ASYNC)
return ret;
return -ret;
ret2 = filemap_fdatawait(mapping);
if (!ret)
ret = ret2;
}
return ret;
return -ret;
}
int
xfs_wait_on_pages(
xfs_inode_t *ip,
xfs_off_t first,
xfs_off_t last)
{
struct address_space *mapping = VFS_I(ip)->i_mapping;
if (mapping_tagged(mapping, PAGECACHE_TAG_WRITEBACK))
return -filemap_fdatawait(mapping);
return 0;
}

2
fs/xfs/linux-2.6/xfs_lrw.c
View File

@ -243,7 +243,7 @@ xfs_read(
if (unlikely(ioflags & IO_ISDIRECT)) {
if (inode->i_mapping->nrpages)
ret = xfs_flushinval_pages(ip, (*offset & PAGE_CACHE_MASK),
ret = -xfs_flushinval_pages(ip, (*offset & PAGE_CACHE_MASK),
-1, FI_REMAPF_LOCKED);
mutex_unlock(&inode->i_mutex);
if (ret) {

13
fs/xfs/linux-2.6/xfs_super.c
View File

@ -990,21 +990,26 @@ xfs_fs_write_inode(
struct inode *inode,
int sync)
{
struct xfs_inode *ip = XFS_I(inode);
int error = 0;
int flags = 0;
xfs_itrace_entry(XFS_I(inode));
xfs_itrace_entry(ip);
if (sync) {
filemap_fdatawait(inode->i_mapping);
error = xfs_wait_on_pages(ip, 0, -1);
if (error)
goto out_error;
flags |= FLUSH_SYNC;
}
error = xfs_inode_flush(XFS_I(inode), flags);
error = xfs_inode_flush(ip, flags);
out_error:
/*
* if we failed to write out the inode then mark
* it dirty again so we'll try again later.
*/
if (error)
xfs_mark_inode_dirty_sync(XFS_I(inode));
xfs_mark_inode_dirty_sync(ip);
return -error;
}

2
fs/xfs/xfs_vnodeops.c
View File

@ -681,7 +681,7 @@ xfs_fsync(
return XFS_ERROR(EIO);
/* capture size updates in I/O completion before writing the inode. */
error = filemap_fdatawait(VFS_I(ip)->i_mapping);
error = xfs_wait_on_pages(ip, 0, -1);
if (error)
return XFS_ERROR(error);

1
fs/xfs/xfs_vnodeops.h
View File

@ -75,5 +75,6 @@ int xfs_flushinval_pages(struct xfs_inode *ip, xfs_off_t first,
xfs_off_t last, int fiopt);
int xfs_flush_pages(struct xfs_inode *ip, xfs_off_t first,
xfs_off_t last, uint64_t flags, int fiopt);
int xfs_wait_on_pages(struct xfs_inode *ip, xfs_off_t first, xfs_off_t last);
#endif /* _XFS_VNODEOPS_H */