There is no fundamental need to keep an in-memory inode size copy in the
XFS inode. We already have the on-disk value in the dinode, and the
separate in-memory copy that we need for regular files only in the
XFS inode.
Remove the xfs_inode i_size field and change the XFS_ISIZE macro to use
the VFS inode i_size field for regular fields. Switch code that was
directly accessing it to either the XFS_ISIZE macro or direct access
of the VFS i_size if the code is limited to regular files and in
highlevel code.
This also allows dropping a a big bunch of fairly complicated code in the
write path which dealt with keeping the xfs_inode i_size uptodate with the
VFS i_size that is getting updated inside ->write_end.
Note that we do not bother resetting the VFS i_size when truncating a file
that gets freed to zero as there is point in doing so. Just relax the
assert in xfs_ifree to only check the on-disk size instead.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
fs/xfs/xfs_aops.c | 2 +-
fs/xfs/xfs_bmap.c | 15 ++++++---------
fs/xfs/xfs_file.c | 45 +++++++++++----------------------------------
fs/xfs/xfs_fs_subr.c | 2 +-
fs/xfs/xfs_iget.c | 1 -
fs/xfs/xfs_inode.c | 8 ++------
fs/xfs/xfs_inode.h | 16 ++++++++++++----
fs/xfs/xfs_iomap.c | 12 ++++++------
fs/xfs/xfs_iops.c | 3 +--
fs/xfs/xfs_qm_syscalls.c | 1 -
fs/xfs/xfs_trace.h | 2 +-
fs/xfs/xfs_vnodeops.c | 31 +++++++++++++++----------------
12 files changed, 56 insertions(+), 82 deletions(-)
Index: xfs/fs/xfs/xfs_aops.c
===================================================================
--- xfs.orig/fs/xfs/xfs_aops.c 2011-10-27 22:39:36.176673721 +0200
+++ xfs/fs/xfs/xfs_aops.c 2011-10-27 22:39:55.654173048 +0200
@@ -111,7 +111,7 @@ xfs_ioend_new_eof(
xfs_fsize_t bsize;
bsize = ioend->io_offset + ioend->io_size;
- isize = MAX(ip->i_size, ip->i_new_size);
+ isize = MAX(i_size_read(VFS_I(ip)), ip->i_new_size);
isize = MIN(isize, bsize);
return isize > ip->i_d.di_size ? isize : 0;
}
Index: xfs/fs/xfs/xfs_file.c
===================================================================
--- xfs.orig/fs/xfs/xfs_file.c 2011-10-27 22:39:36.188673903 +0200
+++ xfs/fs/xfs/xfs_file.c 2011-10-27 22:39:55.658175758 +0200
@@ -327,7 +327,7 @@ xfs_file_aio_read(
mp->m_rtdev_targp : mp->m_ddev_targp;
if ((iocb->ki_pos & target->bt_smask) ||
(size & target->bt_smask)) {
- if (iocb->ki_pos == ip->i_size)
+ if (iocb->ki_pos == i_size_read(inode))
return 0;
return -XFS_ERROR(EINVAL);
}
@@ -412,30 +412,6 @@ xfs_file_splice_read(
return ret;
}
-STATIC void
-xfs_aio_write_isize_update(
- struct inode *inode,
- loff_t *ppos,
- ssize_t bytes_written)
-{
- struct xfs_inode *ip = XFS_I(inode);
- xfs_fsize_t isize = i_size_read(inode);
-
- if (bytes_written > 0)
- XFS_STATS_ADD(xs_write_bytes, bytes_written);
-
- if (unlikely(bytes_written < 0 && bytes_written != -EFAULT &&
- *ppos > isize))
- *ppos = isize;
-
- if (*ppos > ip->i_size) {
- xfs_rw_ilock(ip, XFS_ILOCK_EXCL);
- if (*ppos > ip->i_size)
- ip->i_size = *ppos;
- xfs_rw_iunlock(ip, XFS_ILOCK_EXCL);
- }
-}
-
/*
* If this was a direct or synchronous I/O that failed (such as ENOSPC) then
* part of the I/O may have been written to disk before the error occurred. In
@@ -451,8 +427,8 @@ xfs_aio_write_newsize_update(
xfs_rw_ilock(ip, XFS_ILOCK_EXCL);
if (new_size == ip->i_new_size)
ip->i_new_size = 0;
- if (ip->i_d.di_size > ip->i_size)
- ip->i_d.di_size = ip->i_size;
+ if (ip->i_d.di_size > i_size_read(VFS_I(ip)))
+ ip->i_d.di_size = i_size_read(VFS_I(ip));
xfs_rw_iunlock(ip, XFS_ILOCK_EXCL);
}
}
@@ -492,15 +468,16 @@ xfs_file_splice_write(
new_size = *ppos + count;
xfs_ilock(ip, XFS_ILOCK_EXCL);
- if (new_size > ip->i_size)
+ if (new_size > i_size_read(inode))
ip->i_new_size = new_size;
xfs_iunlock(ip, XFS_ILOCK_EXCL);
trace_xfs_file_splice_write(ip, count, *ppos, ioflags);
ret = generic_file_splice_write(pipe, outfilp, ppos, count, flags);
+ if (ret > 0)
+ XFS_STATS_ADD(xs_write_bytes, ret);
- xfs_aio_write_isize_update(inode, ppos, ret);
xfs_aio_write_newsize_update(ip, new_size);
xfs_iunlock(ip, XFS_IOLOCK_EXCL);
return ret;
@@ -728,14 +705,14 @@ restart:
* values are still valid.
*/
if ((ip->i_new_size && *pos > ip->i_new_size) ||
- (!ip->i_new_size && *pos > ip->i_size)) {
+ (!ip->i_new_size && *pos > i_size_read(inode))) {
if (*iolock == XFS_IOLOCK_SHARED) {
xfs_rw_iunlock(ip, XFS_ILOCK_EXCL | *iolock);
*iolock = XFS_IOLOCK_EXCL;
xfs_rw_ilock(ip, XFS_ILOCK_EXCL | *iolock);
goto restart;
}
- error = -xfs_zero_eof(ip, *pos, ip->i_size);
+ error = -xfs_zero_eof(ip, *pos, i_size_read(inode));
}
/*
@@ -744,7 +721,7 @@ restart:
* ip->i_new_size if this IO ends beyond any other in-flight writes.
*/
new_size = *pos + *count;
- if (new_size > ip->i_size) {
+ if (new_size > i_size_read(inode)) {
if (new_size > ip->i_new_size)
ip->i_new_size = new_size;
*new_sizep = new_size;
@@ -957,11 +934,11 @@ xfs_file_aio_write(
ret = xfs_file_buffered_aio_write(iocb, iovp, nr_segs, pos,
ocount, &new_size, &iolock);
- xfs_aio_write_isize_update(inode, &iocb->ki_pos, ret);
-
if (ret <= 0)
goto out_unlock;
+ XFS_STATS_ADD(xs_write_bytes, ret);
+
/* Handle various SYNC-type writes */
if ((file->f_flags & O_DSYNC) || IS_SYNC(inode)) {
loff_t end = pos + ret - 1;
Index: xfs/fs/xfs/xfs_fs_subr.c
===================================================================
--- xfs.orig/fs/xfs/xfs_fs_subr.c 2011-10-27 22:39:36.200674939 +0200
+++ xfs/fs/xfs/xfs_fs_subr.c 2011-10-27 22:39:55.658175758 +0200
@@ -90,7 +90,7 @@ xfs_wait_on_pages(
if (mapping_tagged(mapping, PAGECACHE_TAG_WRITEBACK)) {
return -filemap_fdatawait_range(mapping, first,
- last == -1 ? ip->i_size - 1 : last);
+ last == -1 ? XFS_ISIZE(ip) - 1 : last);
}
return 0;
}
Index: xfs/fs/xfs/xfs_iops.c
===================================================================
--- xfs.orig/fs/xfs/xfs_iops.c 2011-10-27 22:39:54.754172457 +0200
+++ xfs/fs/xfs/xfs_iops.c 2011-10-27 22:39:55.662176606 +0200
@@ -777,7 +777,7 @@ xfs_setattr_size(
lock_flags |= XFS_IOLOCK_EXCL;
xfs_ilock(ip, lock_flags);
- oldsize = ip->i_size;
+ oldsize = inode->i_size;
newsize = iattr->ia_size;
/*
@@ -896,7 +896,6 @@ xfs_setattr_size(
* they get written to.
*/
ip->i_d.di_size = newsize;
- ip->i_size = newsize;
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
if (newsize <= oldsize) {
Index: xfs/fs/xfs/xfs_trace.h
===================================================================
--- xfs.orig/fs/xfs/xfs_trace.h 2011-10-27 22:39:54.766219243 +0200
+++ xfs/fs/xfs/xfs_trace.h 2011-10-27 22:39:55.670178173 +0200
@@ -1044,7 +1044,7 @@ DECLARE_EVENT_CLASS(xfs_simple_io_class,
TP_fast_assign(
__entry->dev = VFS_I(ip)->i_sb->s_dev;
__entry->ino = ip->i_ino;
- __entry->isize = ip->i_size;
+ __entry->isize = VFS_I(ip)->i_size;
__entry->disize = ip->i_d.di_size;
__entry->new_size = ip->i_new_size;
__entry->offset = offset;
Index: xfs/fs/xfs/xfs_bmap.c
===================================================================
--- xfs.orig/fs/xfs/xfs_bmap.c 2011-10-27 22:39:36.232674580 +0200
+++ xfs/fs/xfs/xfs_bmap.c 2011-10-27 22:39:55.678179028 +0200
@@ -3992,11 +3992,8 @@ xfs_bmap_one_block(
xfs_bmbt_irec_t s; /* internal version of extent */
#ifndef DEBUG
- if (whichfork == XFS_DATA_FORK) {
- return S_ISREG(ip->i_d.di_mode) ?
- (ip->i_size == ip->i_mount->m_sb.sb_blocksize) :
- (ip->i_d.di_size == ip->i_mount->m_sb.sb_blocksize);
- }
+ if (whichfork == XFS_DATA_FORK)
+ return XFS_ISIZE(ip) == ip->i_mount->m_sb.sb_blocksize;
#endif /* !DEBUG */
if (XFS_IFORK_NEXTENTS(ip, whichfork) != 1)
return 0;
@@ -4008,7 +4005,7 @@ xfs_bmap_one_block(
xfs_bmbt_get_all(ep, &s);
rval = s.br_startoff == 0 && s.br_blockcount == 1;
if (rval && whichfork == XFS_DATA_FORK)
- ASSERT(ip->i_size == ip->i_mount->m_sb.sb_blocksize);
+ ASSERT(XFS_ISIZE(ip) == ip->i_mount->m_sb.sb_blocksize);
return rval;
}
@@ -5416,7 +5413,7 @@ xfs_getbmapx_fix_eof_hole(
if (startblock == HOLESTARTBLOCK) {
mp = ip->i_mount;
out->bmv_block = -1;
- fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, ip->i_size));
+ fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, XFS_ISIZE(ip)));
fixlen -= out->bmv_offset;
if (prealloced && out->bmv_offset + out->bmv_length == end) {
/* Came to hole at EOF. Trim it. */
@@ -5504,7 +5501,7 @@ xfs_getbmap(
fixlen = XFS_MAXIOFFSET(mp);
} else {
prealloced = 0;
- fixlen = ip->i_size;
+ fixlen = XFS_ISIZE(ip);
}
}
@@ -5533,7 +5530,7 @@ xfs_getbmap(
xfs_ilock(ip, XFS_IOLOCK_SHARED);
if (whichfork == XFS_DATA_FORK && !(iflags & BMV_IF_DELALLOC)) {
- if (ip->i_delayed_blks || ip->i_size > ip->i_d.di_size) {
+ if (ip->i_delayed_blks || XFS_ISIZE(ip) > ip->i_d.di_size) {
error = xfs_flush_pages(ip, 0, -1, 0, FI_REMAPF);
if (error)
goto out_unlock_iolock;
Index: xfs/fs/xfs/xfs_iget.c
===================================================================
--- xfs.orig/fs/xfs/xfs_iget.c 2011-10-27 22:39:53.000673410 +0200
+++ xfs/fs/xfs/xfs_iget.c 2011-10-27 22:39:55.686173105 +0200
@@ -94,7 +94,6 @@ xfs_inode_alloc(
ip->i_update_core = 0;
ip->i_delayed_blks = 0;
memset(&ip->i_d, 0, sizeof(xfs_icdinode_t));
- ip->i_size = 0;
ip->i_new_size = 0;
return ip;
Index: xfs/fs/xfs/xfs_inode.c
===================================================================
--- xfs.orig/fs/xfs/xfs_inode.c 2011-10-27 22:39:54.754172457 +0200
+++ xfs/fs/xfs/xfs_inode.c 2011-10-27 22:39:55.694176578 +0200
@@ -350,7 +350,6 @@ xfs_iformat(
return XFS_ERROR(EFSCORRUPTED);
}
ip->i_d.di_size = 0;
- ip->i_size = 0;
ip->i_df.if_u2.if_rdev = xfs_dinode_get_rdev(dip);
break;
@@ -861,7 +860,6 @@ xfs_iread(
}
ip->i_delayed_blks = 0;
- ip->i_size = ip->i_d.di_size;
/*
* Mark the buffer containing the inode as something to keep
@@ -1051,7 +1049,6 @@ xfs_ialloc(
}
ip->i_d.di_size = 0;
- ip->i_size = 0;
ip->i_d.di_nextents = 0;
ASSERT(ip->i_d.di_nblocks == 0);
@@ -1206,7 +1203,7 @@ xfs_itruncate_extents(
int done = 0;
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL));
- ASSERT(new_size <= ip->i_size);
+ ASSERT(new_size <= XFS_ISIZE(ip));
ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
ASSERT(ip->i_itemp != NULL);
ASSERT(ip->i_itemp->ili_lock_flags == 0);
@@ -1720,8 +1717,7 @@ xfs_ifree(
ASSERT(ip->i_d.di_nlink == 0);
ASSERT(ip->i_d.di_nextents == 0);
ASSERT(ip->i_d.di_anextents == 0);
- ASSERT((ip->i_d.di_size == 0 && ip->i_size == 0) ||
- (!S_ISREG(ip->i_d.di_mode)));
+ ASSERT(ip->i_d.di_size == 0 || !S_ISREG(ip->i_d.di_mode));
ASSERT(ip->i_d.di_nblocks == 0);
/*
Index: xfs/fs/xfs/xfs_iomap.c
===================================================================
--- xfs.orig/fs/xfs/xfs_iomap.c 2011-10-27 22:39:55.230179804 +0200
+++ xfs/fs/xfs/xfs_iomap.c 2011-10-27 22:39:55.694176578 +0200
@@ -74,7 +74,7 @@ xfs_iomap_eof_align_last_fsb(
else if (mp->m_dalign)
align = mp->m_dalign;
- if (align && ip->i_size >= XFS_FSB_TO_B(mp, align))
+ if (align && XFS_ISIZE(ip) >= XFS_FSB_TO_B(mp, align))
new_last_fsb = roundup_64(*last_fsb, align);
}
@@ -154,7 +154,7 @@ xfs_iomap_write_direct(
offset_fsb = XFS_B_TO_FSBT(mp, offset);
last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
- if ((offset + count) > ip->i_size) {
+ if ((offset + count) > XFS_ISIZE(ip)) {
error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb);
if (error)
goto error_out;
@@ -211,7 +211,7 @@ xfs_iomap_write_direct(
xfs_trans_ijoin(tp, ip, 0);
bmapi_flag = 0;
- if (offset < ip->i_size || extsz)
+ if (offset < XFS_ISIZE(ip) || extsz)
bmapi_flag |= XFS_BMAPI_PREALLOC;
/*
@@ -286,7 +286,7 @@ xfs_iomap_eof_want_preallocate(
int found_delalloc = 0;
*prealloc = 0;
- if ((offset + count) <= ip->i_size)
+ if (offset + count <= XFS_ISIZE(ip))
return 0;
/*
@@ -340,7 +340,7 @@ xfs_iomap_prealloc_size(
* if we pass in alloc_blocks = 0. Hence the "+ 1" to
* ensure we always pass in a non-zero value.
*/
- alloc_blocks = XFS_B_TO_FSB(mp, ip->i_size) + 1;
+ alloc_blocks = XFS_B_TO_FSB(mp, XFS_ISIZE(ip)) + 1;
alloc_blocks = XFS_FILEOFF_MIN(MAXEXTLEN,
rounddown_pow_of_two(alloc_blocks));
@@ -564,7 +564,7 @@ xfs_iomap_write_allocate(
* back....
*/
nimaps = 1;
- end_fsb = XFS_B_TO_FSB(mp, ip->i_size);
+ end_fsb = XFS_B_TO_FSB(mp, XFS_ISIZE(ip));
error = xfs_bmap_last_offset(NULL, ip, &last_block,
XFS_DATA_FORK);
if (error)
Index: xfs/fs/xfs/xfs_vnodeops.c
===================================================================
--- xfs.orig/fs/xfs/xfs_vnodeops.c 2011-10-27 22:39:54.774174431 +0200
+++ xfs/fs/xfs/xfs_vnodeops.c 2011-10-27 22:39:55.698174631 +0200
@@ -169,7 +169,7 @@ xfs_free_eofblocks(
* Figure out if there are any blocks beyond the end
* of the file. If not, then there is nothing to do.
*/
- end_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)ip->i_size));
+ end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_ISIZE(ip));
last_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
if (last_fsb <= end_fsb)
return 0;
@@ -227,7 +227,7 @@ xfs_free_eofblocks(
* may be full of holes (ie NULL files bug).
*/
error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK,
- ip->i_size);
+ XFS_ISIZE(ip));
if (error) {
/*
* If we get an error at this point we simply don't
@@ -541,8 +541,8 @@ xfs_release(
return 0;
if ((S_ISREG(ip->i_d.di_mode) &&
- ((ip->i_size > 0) || (VN_CACHED(VFS_I(ip)) > 0 ||
- ip->i_delayed_blks > 0)) &&
+ (VFS_I(ip)->i_size > 0 ||
+ (VN_CACHED(VFS_I(ip)) > 0 || ip->i_delayed_blks > 0)) &&
(ip->i_df.if_flags & XFS_IFEXTENTS)) &&
(!(ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)))) {
@@ -619,7 +619,7 @@ xfs_inactive(
* only one with a reference to the inode.
*/
truncate = ((ip->i_d.di_nlink == 0) &&
- ((ip->i_d.di_size != 0) || (ip->i_size != 0) ||
+ ((ip->i_d.di_size != 0) || XFS_ISIZE(ip) != 0 ||
(ip->i_d.di_nextents > 0) || (ip->i_delayed_blks > 0)) &&
S_ISREG(ip->i_d.di_mode));
@@ -633,12 +633,12 @@ xfs_inactive(
if (ip->i_d.di_nlink != 0) {
if ((S_ISREG(ip->i_d.di_mode) &&
- ((ip->i_size > 0) || (VN_CACHED(VFS_I(ip)) > 0 ||
- ip->i_delayed_blks > 0)) &&
- (ip->i_df.if_flags & XFS_IFEXTENTS) &&
- (!(ip->i_d.di_flags &
+ (VFS_I(ip)->i_size > 0 ||
+ (VN_CACHED(VFS_I(ip)) > 0 || ip->i_delayed_blks > 0)) &&
+ (ip->i_df.if_flags & XFS_IFEXTENTS) &&
+ (!(ip->i_d.di_flags &
(XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)) ||
- (ip->i_delayed_blks != 0)))) {
+ ip->i_delayed_blks != 0))) {
error = xfs_free_eofblocks(mp, ip, 0);
if (error)
return VN_INACTIVE_CACHE;
@@ -672,7 +672,6 @@ xfs_inactive(
xfs_trans_ijoin(tp, ip, 0);
ip->i_d.di_size = 0;
- ip->i_size = 0;
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, 0);
@@ -1968,11 +1967,11 @@ xfs_zero_remaining_bytes(
* since nothing can read beyond eof. The space will
* be zeroed when the file is extended anyway.
*/
- if (startoff >= ip->i_size)
+ if (startoff >= XFS_ISIZE(ip))
return 0;
- if (endoff > ip->i_size)
- endoff = ip->i_size;
+ if (endoff > XFS_ISIZE(ip))
+ endoff = XFS_ISIZE(ip);
bp = xfs_buf_get_uncached(XFS_IS_REALTIME_INODE(ip) ?
mp->m_rtdev_targp : mp->m_ddev_targp,
@@ -2267,7 +2266,7 @@ xfs_change_file_space(
bf->l_start += offset;
break;
case 2: /*SEEK_END*/
- bf->l_start += ip->i_size;
+ bf->l_start += XFS_ISIZE(ip);
break;
default:
return XFS_ERROR(EINVAL);
@@ -2284,7 +2283,7 @@ xfs_change_file_space(
bf->l_whence = 0;
startoffset = bf->l_start;
- fsize = ip->i_size;
+ fsize = XFS_ISIZE(ip);
/*
* XFS_IOC_RESVSP and XFS_IOC_UNRESVSP will reserve or unreserve
Index: xfs/fs/xfs/xfs_inode.h
===================================================================
--- xfs.orig/fs/xfs/xfs_inode.h 2011-10-27 22:39:54.754172457 +0200
+++ xfs/fs/xfs/xfs_inode.h 2011-10-27 22:39:55.704670968 +0200
@@ -246,16 +246,12 @@ typedef struct xfs_inode {
xfs_icdinode_t i_d; /* most of ondisk inode */
- xfs_fsize_t i_size; /* in-memory size */
xfs_fsize_t i_new_size; /* size when write completes */
/* VFS inode */
struct inode i_vnode; /* embedded VFS inode */
} xfs_inode_t;
-#define XFS_ISIZE(ip) S_ISREG((ip)->i_d.di_mode) ? \
- (ip)->i_size : (ip)->i_d.di_size;
-
/* Convert from vfs inode to xfs inode */
static inline struct xfs_inode *XFS_I(struct inode *inode)
{
@@ -269,6 +265,18 @@ static inline struct inode *VFS_I(struct
}
/*
+ * For regular files we only update the on-disk filesize when actually
+ * writing data back to disk. Until then only the copy in the VFS inode
+ * is uptodate.
+ */
+static inline xfs_fsize_t XFS_ISIZE(struct xfs_inode *ip)
+{
+ if (S_ISREG(ip->i_d.di_mode))
+ return i_size_read(VFS_I(ip));
+ return ip->i_d.di_size;
+}
+
+/*
* i_flags helper functions
*/
static inline void
Index: xfs/fs/xfs/xfs_qm_syscalls.c
===================================================================
--- xfs.orig/fs/xfs/xfs_qm_syscalls.c 2011-10-27 22:39:54.758172111 +0200
+++ xfs/fs/xfs/xfs_qm_syscalls.c 2011-10-27 22:39:55.704670968 +0200
@@ -265,7 +265,6 @@ xfs_qm_scall_trunc_qfile(
xfs_trans_ijoin(tp, ip, 0);
ip->i_d.di_size = 0;
- ip->i_size = 0;
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, 0);
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