1 files changed, 95 insertions, 68 deletions

diff --git a/fs/xfs/linux-2.6/xfs_lrw.c b/fs/xfs/linux-2.6/xfs_lrw.c
index 558076dd0752..86fb671a8bcc 100644
--- a/fs/xfs/linux-2.6/xfs_lrw.c
+++ b/fs/xfs/linux-2.6/xfs_lrw.c
@@ -191,7 +191,7 @@ xfs_read(
         struct file             *file = iocb->ki_filp;
         struct inode            *inode = file->f_mapping->host;
         size_t                  size = 0;
-        ssize_t                 ret;
+        ssize_t                 ret = 0;
         xfs_fsize_t             n;
         xfs_inode_t             *ip;
         xfs_mount_t             *mp;
@@ -224,7 +224,7 @@ xfs_read(
                                 mp->m_rtdev_targp : mp->m_ddev_targp;
                 if ((*offset & target->bt_smask) ||
                     (size & target->bt_smask)) {
-                        if (*offset == ip->i_d.di_size) {
+                        if (*offset == ip->i_size) {
                                 return (0);
                         }
                         return -XFS_ERROR(EINVAL);
@@ -263,9 +263,13 @@ xfs_read(
 
         if (unlikely(ioflags & IO_ISDIRECT)) {
                 if (VN_CACHED(vp))
-                        bhv_vop_flushinval_pages(vp, ctooff(offtoct(*offset)),
+                        ret = bhv_vop_flushinval_pages(vp, ctooff(offtoct(*offset)),
                                                  -1, FI_REMAPF_LOCKED);
                 mutex_unlock(&inode->i_mutex);
+                if (ret) {
+                        xfs_iunlock(ip, XFS_IOLOCK_SHARED);
+                        return ret;
+                }
         }
 
         xfs_rw_enter_trace(XFS_READ_ENTER, &ip->i_iocore,
@@ -383,9 +387,10 @@ xfs_splice_write(
 {
         xfs_inode_t             *ip = XFS_BHVTOI(bdp);
         xfs_mount_t             *mp = ip->i_mount;
+        xfs_iocore_t            *io = &ip->i_iocore;
         ssize_t                 ret;
         struct inode            *inode = outfilp->f_mapping->host;
-        xfs_fsize_t             isize;
+        xfs_fsize_t             isize, new_size;
 
         XFS_STATS_INC(xs_write_calls);
         if (XFS_FORCED_SHUTDOWN(ip->i_mount))
@@ -406,6 +411,14 @@ xfs_splice_write(
                         return -error;
                 }
         }
+
+        new_size = *ppos + count;
+
+        xfs_ilock(ip, XFS_ILOCK_EXCL);
+        if (new_size > ip->i_size)
+                io->io_new_size = new_size;
+        xfs_iunlock(ip, XFS_ILOCK_EXCL);
+
         xfs_rw_enter_trace(XFS_SPLICE_WRITE_ENTER, &ip->i_iocore,
                            pipe, count, *ppos, ioflags);
         ret = generic_file_splice_write(pipe, outfilp, ppos, count, flags);
@@ -416,14 +429,18 @@ xfs_splice_write(
         if (unlikely(ret < 0 && ret != -EFAULT && *ppos > isize))
                 *ppos = isize;
 
-        if (*ppos > ip->i_d.di_size) {
+        if (*ppos > ip->i_size) {
                 xfs_ilock(ip, XFS_ILOCK_EXCL);
-                if (*ppos > ip->i_d.di_size) {
-                        ip->i_d.di_size = *ppos;
-                        i_size_write(inode, *ppos);
-                        ip->i_update_core = 1;
-                        ip->i_update_size = 1;
-                }
+                if (*ppos > ip->i_size)
+                        ip->i_size = *ppos;
+                xfs_iunlock(ip, XFS_ILOCK_EXCL);
+        }
+
+        if (io->io_new_size) {
+                xfs_ilock(ip, XFS_ILOCK_EXCL);
+                io->io_new_size = 0;
+                if (ip->i_d.di_size > ip->i_size)
+                        ip->i_d.di_size = ip->i_size;
                 xfs_iunlock(ip, XFS_ILOCK_EXCL);
         }
         xfs_iunlock(ip, XFS_IOLOCK_EXCL);
@@ -644,7 +661,7 @@ xfs_write(
         bhv_vrwlock_t           locktype;
         size_t                  ocount = 0, count;
         loff_t                  pos;
-        int                     need_i_mutex = 1, need_flush = 0;
+        int                     need_i_mutex;
 
         XFS_STATS_INC(xs_write_calls);
 
@@ -669,39 +686,20 @@ xfs_write(
         if (XFS_FORCED_SHUTDOWN(mp))
                 return -EIO;
 
-        if (ioflags & IO_ISDIRECT) {
-                xfs_buftarg_t   *target =
-                        (xip->i_d.di_flags & XFS_DIFLAG_REALTIME) ?
-                                mp->m_rtdev_targp : mp->m_ddev_targp;
-
-                if ((pos & target->bt_smask) || (count & target->bt_smask))
-                        return XFS_ERROR(-EINVAL);
-
-                if (!VN_CACHED(vp) && pos < i_size_read(inode))
-                        need_i_mutex = 0;
-
-                if (VN_CACHED(vp))
-                        need_flush = 1;
-        }
-
 relock:
-        if (need_i_mutex) {
+        if (ioflags & IO_ISDIRECT) {
+                iolock = XFS_IOLOCK_SHARED;
+                locktype = VRWLOCK_WRITE_DIRECT;
+                need_i_mutex = 0;
+        } else {
                 iolock = XFS_IOLOCK_EXCL;
                 locktype = VRWLOCK_WRITE;
-
+                need_i_mutex = 1;
                 mutex_lock(&inode->i_mutex);
-        } else {
-                iolock = XFS_IOLOCK_SHARED;
-                locktype = VRWLOCK_WRITE_DIRECT;
         }
 
         xfs_ilock(xip, XFS_ILOCK_EXCL|iolock);
 
-        isize = i_size_read(inode);
-
-        if (file->f_flags & O_APPEND)
-                *offset = isize;
-
 start:
         error = -generic_write_checks(file, &pos, &count,
                                         S_ISBLK(inode->i_mode));
@@ -710,13 +708,8 @@ start:
                 goto out_unlock_mutex;
         }
 
-        new_size = pos + count;
-        if (new_size > isize)
-                io->io_new_size = new_size;
-
         if ((DM_EVENT_ENABLED(vp->v_vfsp, xip, DM_EVENT_WRITE) &&
             !(ioflags & IO_INVIS) && !eventsent)) {
-                loff_t          savedsize = pos;
                 int             dmflags = FILP_DELAY_FLAG(file);
 
                 if (need_i_mutex)
@@ -727,8 +720,7 @@ start:
                                       pos, count,
                                       dmflags, &locktype);
                 if (error) {
-                        xfs_iunlock(xip, iolock);
-                        goto out_unlock_mutex;
+                        goto out_unlock_internal;
                 }
                 xfs_ilock(xip, XFS_ILOCK_EXCL);
                 eventsent = 1;
@@ -740,12 +732,35 @@ start:
                  * event prevents another call to XFS_SEND_DATA, which is
                  * what allows the size to change in the first place.
                  */
-                if ((file->f_flags & O_APPEND) && savedsize != isize) {
-                        pos = isize = xip->i_d.di_size;
+                if ((file->f_flags & O_APPEND) && pos != xip->i_size)
+                        goto start;
+        }
+
+        if (ioflags & IO_ISDIRECT) {
+                xfs_buftarg_t   *target =
+                        (xip->i_d.di_flags & XFS_DIFLAG_REALTIME) ?
+                                mp->m_rtdev_targp : mp->m_ddev_targp;
+
+                if ((pos & target->bt_smask) || (count & target->bt_smask)) {
+                        xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock);
+                        return XFS_ERROR(-EINVAL);
+                }
+
+                if (!need_i_mutex && (VN_CACHED(vp) || pos > xip->i_size)) {
+                        xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock);
+                        iolock = XFS_IOLOCK_EXCL;
+                        locktype = VRWLOCK_WRITE;
+                        need_i_mutex = 1;
+                        mutex_lock(&inode->i_mutex);
+                        xfs_ilock(xip, XFS_ILOCK_EXCL|iolock);
                         goto start;
                 }
         }
 
+        new_size = pos + count;
+        if (new_size > xip->i_size)
+                io->io_new_size = new_size;
+
         if (likely(!(ioflags & IO_INVIS))) {
                 file_update_time(file);
                 xfs_ichgtime_fast(xip, inode,
@@ -761,11 +776,11 @@ start:
          * to zero it out up to the new size.
          */
 
-        if (pos > isize) {
-                error = xfs_zero_eof(BHV_TO_VNODE(bdp), io, pos, isize);
+        if (pos > xip->i_size) {
+                error = xfs_zero_eof(BHV_TO_VNODE(bdp), io, pos, xip->i_size);
                 if (error) {
-                        xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock);
-                        goto out_unlock_mutex;
+                        xfs_iunlock(xip, XFS_ILOCK_EXCL);
+                        goto out_unlock_internal;
                 }
         }
         xfs_iunlock(xip, XFS_ILOCK_EXCL);
@@ -785,8 +800,7 @@ start:
                 if (likely(!error))
                         error = -remove_suid(file->f_path.dentry);
                 if (unlikely(error)) {
-                        xfs_iunlock(xip, iolock);
-                        goto out_unlock_mutex;
+                        goto out_unlock_internal;
                 }
         }
 
@@ -795,11 +809,14 @@ retry:
         current->backing_dev_info = mapping->backing_dev_info;
 
         if ((ioflags & IO_ISDIRECT)) {
-                if (need_flush) {
+                if (VN_CACHED(vp)) {
+                        WARN_ON(need_i_mutex == 0);
                         xfs_inval_cached_trace(io, pos, -1,
                                         ctooff(offtoct(pos)), -1);
-                        bhv_vop_flushinval_pages(vp, ctooff(offtoct(pos)),
+                        error = bhv_vop_flushinval_pages(vp, ctooff(offtoct(pos)),
                                         -1, FI_REMAPF_LOCKED);
+                        if (error)
+                                goto out_unlock_internal;
                 }
 
                 if (need_i_mutex) {
@@ -827,7 +844,6 @@ retry:
                         pos += ret;
                         count -= ret;
 
-                        need_i_mutex = 1;
                         ioflags &= ~IO_ISDIRECT;
                         xfs_iunlock(xip, iolock);
                         goto relock;
@@ -854,12 +870,12 @@ retry:
                 error = XFS_SEND_NAMESP(xip->i_mount, DM_EVENT_NOSPACE, vp,
                                 DM_RIGHT_NULL, vp, DM_RIGHT_NULL, NULL, NULL,
                                 0, 0, 0); /* Delay flag intentionally  unused */
-                if (error)
-                        goto out_nounlocks;
                 if (need_i_mutex)
                         mutex_lock(&inode->i_mutex);
                 xfs_rwlock(bdp, locktype);
-                pos = xip->i_d.di_size;
+                if (error)
+                        goto out_unlock_internal;
+                pos = xip->i_size;
                 ret = 0;
                 goto retry;
         }
@@ -868,14 +884,10 @@ retry:
         if (unlikely(ret < 0 && ret != -EFAULT && *offset > isize))
                 *offset = isize;
 
-        if (*offset > xip->i_d.di_size) {
+        if (*offset > xip->i_size) {
                 xfs_ilock(xip, XFS_ILOCK_EXCL);
-                if (*offset > xip->i_d.di_size) {
-                        xip->i_d.di_size = *offset;
-                        i_size_write(inode, *offset);
-                        xip->i_update_core = 1;
-                        xip->i_update_size = 1;
-                }
+                if (*offset > xip->i_size)
+                        xip->i_size = *offset;
                 xfs_iunlock(xip, XFS_ILOCK_EXCL);
         }
 
@@ -897,16 +909,31 @@ retry:
 
                 error = sync_page_range(inode, mapping, pos, ret);
                 if (!error)
-                        error = ret;
-                return error;
+                        error = -ret;
+                if (need_i_mutex)
+                        mutex_lock(&inode->i_mutex);
+                xfs_rwlock(bdp, locktype);
         }
 
  out_unlock_internal:
+        if (io->io_new_size) {
+                xfs_ilock(xip, XFS_ILOCK_EXCL);
+                io->io_new_size = 0;
+                /*
+                 * 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 occured.  In this case the on-disk
+                 * file size may have been adjusted beyond the in-memory file
+                 * size and now needs to be truncated back.
+                 */
+                if (xip->i_d.di_size > xip->i_size)
+                        xip->i_d.di_size = xip->i_size;
+                xfs_iunlock(xip, XFS_ILOCK_EXCL);
+        }
         xfs_rwunlock(bdp, locktype);
  out_unlock_mutex:
         if (need_i_mutex)
                 mutex_unlock(&inode->i_mutex);
- out_nounlocks:
         return -error;
 }