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xfs: remove wrappers for read/write file operations

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Currently the aio_read, aio_write, splice_read and splice_write file
operations are divided into a low-level routine doing all the work
and one that implements the Linux file operations and does minimal
argument wrapping.  This is a leftover from the days of the vnode
operations layer and can be removed to simplify the code a lot.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <david@fromorbit.com>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Christoph Hellwig 2010-02-15 09:44:47 +00:00 committed by Alex Elder
parent dda35b8f84
commit 00258e36b2
1 changed files with 113 additions and 170 deletions
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281
fs/xfs/linux-2.6/xfs_file.c
View File

@ -96,28 +96,34 @@ xfs_iozero(
return (-status); return (-status);
} }
ssize_t /* bytes read, or (-) error */ STATIC ssize_t
xfs_read( xfs_file_aio_read(
xfs_inode_t *ip,
struct kiocb *iocb, struct kiocb *iocb,
const struct iovec *iovp, const struct iovec *iovp,
unsigned int segs, unsigned long nr_segs,
loff_t *offset, loff_t pos)
int ioflags)
{ {
struct file *file = iocb->ki_filp; struct file *file = iocb->ki_filp;
struct inode *inode = file->f_mapping->host; struct inode *inode = file->f_mapping->host;
xfs_mount_t *mp = ip->i_mount; struct xfs_inode *ip = XFS_I(inode);
struct xfs_mount *mp = ip->i_mount;
size_t size = 0; size_t size = 0;
ssize_t ret = 0; ssize_t ret = 0;
int ioflags = 0;
xfs_fsize_t n; xfs_fsize_t n;
unsigned long seg; unsigned long seg;
XFS_STATS_INC(xs_read_calls); XFS_STATS_INC(xs_read_calls);
BUG_ON(iocb->ki_pos != pos);
if (unlikely(file->f_flags & O_DIRECT))
ioflags |= IO_ISDIRECT;
if (file->f_mode & FMODE_NOCMTIME)
ioflags |= IO_INVIS;
/* START copy & waste from filemap.c */ /* START copy & waste from filemap.c */
for (seg = 0; seg < segs; seg++) { for (seg = 0; seg < nr_segs; seg++) {
const struct iovec *iv = &iovp[seg]; const struct iovec *iv = &iovp[seg];
/* /*
@ -134,17 +140,16 @@ xfs_read(
xfs_buftarg_t *target = xfs_buftarg_t *target =
XFS_IS_REALTIME_INODE(ip) ? XFS_IS_REALTIME_INODE(ip) ?
mp->m_rtdev_targp : mp->m_ddev_targp; mp->m_rtdev_targp : mp->m_ddev_targp;
if ((*offset & target->bt_smask) || if ((iocb->ki_pos & target->bt_smask) ||
(size & target->bt_smask)) { (size & target->bt_smask)) {
if (*offset == ip->i_size) { if (iocb->ki_pos == ip->i_size)
return (0); return 0;
}
return -XFS_ERROR(EINVAL); return -XFS_ERROR(EINVAL);
} }
} }
n = XFS_MAXIOFFSET(mp) - *offset; n = XFS_MAXIOFFSET(mp) - iocb->ki_pos;
if ((n <= 0) || (size == 0)) if (n <= 0 || size == 0)
return 0; return 0;
if (n < size) if (n < size)
@ -161,7 +166,7 @@ xfs_read(
int dmflags = FILP_DELAY_FLAG(file) | DM_SEM_FLAG_RD(ioflags); int dmflags = FILP_DELAY_FLAG(file) | DM_SEM_FLAG_RD(ioflags);
int iolock = XFS_IOLOCK_SHARED; int iolock = XFS_IOLOCK_SHARED;
ret = -XFS_SEND_DATA(mp, DM_EVENT_READ, ip, *offset, size, ret = -XFS_SEND_DATA(mp, DM_EVENT_READ, ip, iocb->ki_pos, size,
dmflags, &iolock); dmflags, &iolock);
if (ret) { if (ret) {
xfs_iunlock(ip, XFS_IOLOCK_SHARED); xfs_iunlock(ip, XFS_IOLOCK_SHARED);
@ -172,9 +177,11 @@ xfs_read(
} }
if (unlikely(ioflags & IO_ISDIRECT)) { if (unlikely(ioflags & IO_ISDIRECT)) {
if (inode->i_mapping->nrpages) if (inode->i_mapping->nrpages) {
ret = -xfs_flushinval_pages(ip, (*offset & PAGE_CACHE_MASK), ret = -xfs_flushinval_pages(ip,
(iocb->ki_pos & PAGE_CACHE_MASK),
-1, FI_REMAPF_LOCKED); -1, FI_REMAPF_LOCKED);
}
mutex_unlock(&inode->i_mutex); mutex_unlock(&inode->i_mutex);
if (ret) { if (ret) {
xfs_iunlock(ip, XFS_IOLOCK_SHARED); xfs_iunlock(ip, XFS_IOLOCK_SHARED);
@ -182,10 +189,9 @@ xfs_read(
} }
} }
trace_xfs_file_read(ip, size, *offset, ioflags); trace_xfs_file_read(ip, size, iocb->ki_pos, ioflags);
iocb->ki_pos = *offset; ret = generic_file_aio_read(iocb, iovp, nr_segs, iocb->ki_pos);
ret = generic_file_aio_read(iocb, iovp, segs, *offset);
if (ret > 0) if (ret > 0)
XFS_STATS_ADD(xs_read_bytes, ret); XFS_STATS_ADD(xs_read_bytes, ret);
@ -193,20 +199,24 @@ xfs_read(
return ret; return ret;
} }
ssize_t STATIC ssize_t
xfs_splice_read( xfs_file_splice_read(
xfs_inode_t *ip,
struct file *infilp, struct file *infilp,
loff_t *ppos, loff_t *ppos,
struct pipe_inode_info *pipe, struct pipe_inode_info *pipe,
size_t count, size_t count,
int flags, unsigned int flags)
int ioflags)
{ {
xfs_mount_t *mp = ip->i_mount; struct xfs_inode *ip = XFS_I(infilp->f_mapping->host);
struct xfs_mount *mp = ip->i_mount;
int ioflags = 0;
ssize_t ret; ssize_t ret;
XFS_STATS_INC(xs_read_calls); XFS_STATS_INC(xs_read_calls);
if (infilp->f_mode & FMODE_NOCMTIME)
ioflags |= IO_INVIS;
if (XFS_FORCED_SHUTDOWN(ip->i_mount)) if (XFS_FORCED_SHUTDOWN(ip->i_mount))
return -EIO; return -EIO;
@ -234,22 +244,26 @@ xfs_splice_read(
return ret; return ret;
} }
ssize_t STATIC ssize_t
xfs_splice_write( xfs_file_splice_write(
xfs_inode_t *ip,
struct pipe_inode_info *pipe, struct pipe_inode_info *pipe,
struct file *outfilp, struct file *outfilp,
loff_t *ppos, loff_t *ppos,
size_t count, size_t count,
int flags, unsigned int flags)
int ioflags)
{ {
xfs_mount_t *mp = ip->i_mount;
ssize_t ret;
struct inode *inode = outfilp->f_mapping->host; struct inode *inode = outfilp->f_mapping->host;
struct xfs_inode *ip = XFS_I(inode);
struct xfs_mount *mp = ip->i_mount;
xfs_fsize_t isize, new_size; xfs_fsize_t isize, new_size;
int ioflags = 0;
ssize_t ret;
XFS_STATS_INC(xs_write_calls); XFS_STATS_INC(xs_write_calls);
if (outfilp->f_mode & FMODE_NOCMTIME)
ioflags |= IO_INVIS;
if (XFS_FORCED_SHUTDOWN(ip->i_mount)) if (XFS_FORCED_SHUTDOWN(ip->i_mount))
return -EIO; return -EIO;
@ -484,42 +498,43 @@ out_lock:
return error; return error;
} }
ssize_t /* bytes written, or (-) error */ STATIC ssize_t
xfs_write( xfs_file_aio_write(
struct xfs_inode *xip,
struct kiocb *iocb, struct kiocb *iocb,
const struct iovec *iovp, const struct iovec *iovp,
unsigned int nsegs, unsigned long nr_segs,
loff_t *offset, loff_t pos)
int ioflags)
{ {
struct file *file = iocb->ki_filp; struct file *file = iocb->ki_filp;
struct address_space *mapping = file->f_mapping; struct address_space *mapping = file->f_mapping;
struct inode *inode = mapping->host; struct inode *inode = mapping->host;
unsigned long segs = nsegs; struct xfs_inode *ip = XFS_I(inode);
xfs_mount_t *mp; struct xfs_mount *mp = ip->i_mount;
ssize_t ret = 0, error = 0; ssize_t ret = 0, error = 0;
int ioflags = 0;
xfs_fsize_t isize, new_size; xfs_fsize_t isize, new_size;
int iolock; int iolock;
int eventsent = 0; int eventsent = 0;
size_t ocount = 0, count; size_t ocount = 0, count;
loff_t pos;
int need_i_mutex; int need_i_mutex;
XFS_STATS_INC(xs_write_calls); XFS_STATS_INC(xs_write_calls);
error = generic_segment_checks(iovp, &segs, &ocount, VERIFY_READ); BUG_ON(iocb->ki_pos != pos);
if (unlikely(file->f_flags & O_DIRECT))
ioflags |= IO_ISDIRECT;
if (file->f_mode & FMODE_NOCMTIME)
ioflags |= IO_INVIS;
error = generic_segment_checks(iovp, &nr_segs, &ocount, VERIFY_READ);
if (error) if (error)
return error; return error;
count = ocount; count = ocount;
pos = *offset;
if (count == 0) if (count == 0)
return 0; return 0;
mp = xip->i_mount;
xfs_wait_for_freeze(mp, SB_FREEZE_WRITE); xfs_wait_for_freeze(mp, SB_FREEZE_WRITE);
if (XFS_FORCED_SHUTDOWN(mp)) if (XFS_FORCED_SHUTDOWN(mp))
@ -535,30 +550,30 @@ relock:
mutex_lock(&inode->i_mutex); mutex_lock(&inode->i_mutex);
} }
xfs_ilock(xip, XFS_ILOCK_EXCL|iolock); xfs_ilock(ip, XFS_ILOCK_EXCL|iolock);
start: start:
error = -generic_write_checks(file, &pos, &count, error = -generic_write_checks(file, &pos, &count,
S_ISBLK(inode->i_mode)); S_ISBLK(inode->i_mode));
if (error) { if (error) {
xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock); xfs_iunlock(ip, XFS_ILOCK_EXCL|iolock);
goto out_unlock_mutex; goto out_unlock_mutex;
} }
if ((DM_EVENT_ENABLED(xip, DM_EVENT_WRITE) && if ((DM_EVENT_ENABLED(ip, DM_EVENT_WRITE) &&
!(ioflags & IO_INVIS) && !eventsent)) { !(ioflags & IO_INVIS) && !eventsent)) {
int dmflags = FILP_DELAY_FLAG(file); int dmflags = FILP_DELAY_FLAG(file);
if (need_i_mutex) if (need_i_mutex)
dmflags |= DM_FLAGS_IMUX; dmflags |= DM_FLAGS_IMUX;
xfs_iunlock(xip, XFS_ILOCK_EXCL); xfs_iunlock(ip, XFS_ILOCK_EXCL);
error = XFS_SEND_DATA(xip->i_mount, DM_EVENT_WRITE, xip, error = XFS_SEND_DATA(ip->i_mount, DM_EVENT_WRITE, ip,
pos, count, dmflags, &iolock); pos, count, dmflags, &iolock);
if (error) { if (error) {
goto out_unlock_internal; goto out_unlock_internal;
} }
xfs_ilock(xip, XFS_ILOCK_EXCL); xfs_ilock(ip, XFS_ILOCK_EXCL);
eventsent = 1; eventsent = 1;
/* /*
@ -568,33 +583,33 @@ start:
* event prevents another call to XFS_SEND_DATA, which is * event prevents another call to XFS_SEND_DATA, which is
* what allows the size to change in the first place. * what allows the size to change in the first place.
*/ */
if ((file->f_flags & O_APPEND) && pos != xip->i_size) if ((file->f_flags & O_APPEND) && pos != ip->i_size)
goto start; goto start;
} }
if (ioflags & IO_ISDIRECT) { if (ioflags & IO_ISDIRECT) {
xfs_buftarg_t *target = xfs_buftarg_t *target =
XFS_IS_REALTIME_INODE(xip) ? XFS_IS_REALTIME_INODE(ip) ?
mp->m_rtdev_targp : mp->m_ddev_targp; mp->m_rtdev_targp : mp->m_ddev_targp;
if ((pos & target->bt_smask) || (count & target->bt_smask)) { if ((pos & target->bt_smask) || (count & target->bt_smask)) {
xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock); xfs_iunlock(ip, XFS_ILOCK_EXCL|iolock);
return XFS_ERROR(-EINVAL); return XFS_ERROR(-EINVAL);
} }
if (!need_i_mutex && (mapping->nrpages || pos > xip->i_size)) { if (!need_i_mutex && (mapping->nrpages || pos > ip->i_size)) {
xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock); xfs_iunlock(ip, XFS_ILOCK_EXCL|iolock);
iolock = XFS_IOLOCK_EXCL; iolock = XFS_IOLOCK_EXCL;
need_i_mutex = 1; need_i_mutex = 1;
mutex_lock(&inode->i_mutex); mutex_lock(&inode->i_mutex);
xfs_ilock(xip, XFS_ILOCK_EXCL|iolock); xfs_ilock(ip, XFS_ILOCK_EXCL|iolock);
goto start; goto start;
} }
} }
new_size = pos + count; new_size = pos + count;
if (new_size > xip->i_size) if (new_size > ip->i_size)
xip->i_new_size = new_size; ip->i_new_size = new_size;
if (likely(!(ioflags & IO_INVIS))) if (likely(!(ioflags & IO_INVIS)))
file_update_time(file); file_update_time(file);
@ -608,14 +623,14 @@ start:
* to zero it out up to the new size. * to zero it out up to the new size.
*/ */
if (pos > xip->i_size) { if (pos > ip->i_size) {
error = xfs_zero_eof(xip, pos, xip->i_size); error = xfs_zero_eof(ip, pos, ip->i_size);
if (error) { if (error) {
xfs_iunlock(xip, XFS_ILOCK_EXCL); xfs_iunlock(ip, XFS_ILOCK_EXCL);
goto out_unlock_internal; goto out_unlock_internal;
} }
} }
xfs_iunlock(xip, XFS_ILOCK_EXCL); xfs_iunlock(ip, XFS_ILOCK_EXCL);
/* /*
* If we're writing the file then make sure to clear the * If we're writing the file then make sure to clear the
@ -633,7 +648,7 @@ start:
if ((ioflags & IO_ISDIRECT)) { if ((ioflags & IO_ISDIRECT)) {
if (mapping->nrpages) { if (mapping->nrpages) {
WARN_ON(need_i_mutex == 0); WARN_ON(need_i_mutex == 0);
error = xfs_flushinval_pages(xip, error = xfs_flushinval_pages(ip,
(pos & PAGE_CACHE_MASK), (pos & PAGE_CACHE_MASK),
-1, FI_REMAPF_LOCKED); -1, FI_REMAPF_LOCKED);
if (error) if (error)
@ -642,16 +657,16 @@ start:
if (need_i_mutex) { if (need_i_mutex) {
/* demote the lock now the cached pages are gone */ /* demote the lock now the cached pages are gone */
xfs_ilock_demote(xip, XFS_IOLOCK_EXCL); xfs_ilock_demote(ip, XFS_IOLOCK_EXCL);
mutex_unlock(&inode->i_mutex); mutex_unlock(&inode->i_mutex);
iolock = XFS_IOLOCK_SHARED; iolock = XFS_IOLOCK_SHARED;
need_i_mutex = 0; need_i_mutex = 0;
} }
trace_xfs_file_direct_write(xip, count, *offset, ioflags); trace_xfs_file_direct_write(ip, count, iocb->ki_pos, ioflags);
ret = generic_file_direct_write(iocb, iovp, ret = generic_file_direct_write(iocb, iovp,
&segs, pos, offset, count, ocount); &nr_segs, pos, &iocb->ki_pos, count, ocount);
/* /*
* direct-io write to a hole: fall through to buffered I/O * direct-io write to a hole: fall through to buffered I/O
@ -664,7 +679,7 @@ start:
count -= ret; count -= ret;
ioflags &= ~IO_ISDIRECT; ioflags &= ~IO_ISDIRECT;
xfs_iunlock(xip, iolock); xfs_iunlock(ip, iolock);
goto relock; goto relock;
} }
} else { } else {
@ -672,15 +687,15 @@ start:
ssize_t ret2 = 0; ssize_t ret2 = 0;
write_retry: write_retry:
trace_xfs_file_buffered_write(xip, count, *offset, ioflags); trace_xfs_file_buffered_write(ip, count, iocb->ki_pos, ioflags);
ret2 = generic_file_buffered_write(iocb, iovp, segs, ret2 = generic_file_buffered_write(iocb, iovp, nr_segs,
pos, offset, count, ret); pos, &iocb->ki_pos, count, ret);
/* /*
* if we just got an ENOSPC, flush the inode now we * if we just got an ENOSPC, flush the inode now we
* aren't holding any page locks and retry *once* * aren't holding any page locks and retry *once*
*/ */
if (ret2 == -ENOSPC && !enospc) { if (ret2 == -ENOSPC && !enospc) {
error = xfs_flush_pages(xip, 0, -1, 0, FI_NONE); error = xfs_flush_pages(ip, 0, -1, 0, FI_NONE);
if (error) if (error)
goto out_unlock_internal; goto out_unlock_internal;
enospc = 1; enospc = 1;
@ -692,27 +707,27 @@ write_retry:
current->backing_dev_info = NULL; current->backing_dev_info = NULL;
isize = i_size_read(inode); isize = i_size_read(inode);
if (unlikely(ret < 0 && ret != -EFAULT && *offset > isize)) if (unlikely(ret < 0 && ret != -EFAULT && iocb->ki_pos > isize))
*offset = isize; iocb->ki_pos = isize;
if (*offset > xip->i_size) { if (iocb->ki_pos > ip->i_size) {
xfs_ilock(xip, XFS_ILOCK_EXCL); xfs_ilock(ip, XFS_ILOCK_EXCL);
if (*offset > xip->i_size) if (iocb->ki_pos > ip->i_size)
xip->i_size = *offset; ip->i_size = iocb->ki_pos;
xfs_iunlock(xip, XFS_ILOCK_EXCL); xfs_iunlock(ip, XFS_ILOCK_EXCL);
} }
if (ret == -ENOSPC && if (ret == -ENOSPC &&
DM_EVENT_ENABLED(xip, DM_EVENT_NOSPACE) && !(ioflags & IO_INVIS)) { DM_EVENT_ENABLED(ip, DM_EVENT_NOSPACE) && !(ioflags & IO_INVIS)) {
xfs_iunlock(xip, iolock); xfs_iunlock(ip, iolock);
if (need_i_mutex) if (need_i_mutex)
mutex_unlock(&inode->i_mutex); mutex_unlock(&inode->i_mutex);
error = XFS_SEND_NAMESP(xip->i_mount, DM_EVENT_NOSPACE, xip, error = XFS_SEND_NAMESP(ip->i_mount, DM_EVENT_NOSPACE, ip,
DM_RIGHT_NULL, xip, DM_RIGHT_NULL, NULL, NULL, DM_RIGHT_NULL, ip, DM_RIGHT_NULL, NULL, NULL,
0, 0, 0); /* Delay flag intentionally unused */ 0, 0, 0); /* Delay flag intentionally unused */
if (need_i_mutex) if (need_i_mutex)
mutex_lock(&inode->i_mutex); mutex_lock(&inode->i_mutex);
xfs_ilock(xip, iolock); xfs_ilock(ip, iolock);
if (error) if (error)
goto out_unlock_internal; goto out_unlock_internal;
goto start; goto start;
@ -729,7 +744,7 @@ write_retry:
loff_t end = pos + ret - 1; loff_t end = pos + ret - 1;
int error2; int error2;
xfs_iunlock(xip, iolock); xfs_iunlock(ip, iolock);
if (need_i_mutex) if (need_i_mutex)
mutex_unlock(&inode->i_mutex); mutex_unlock(&inode->i_mutex);
@ -738,17 +753,17 @@ write_retry:
error = error2; error = error2;
if (need_i_mutex) if (need_i_mutex)
mutex_lock(&inode->i_mutex); mutex_lock(&inode->i_mutex);
xfs_ilock(xip, iolock); xfs_ilock(ip, iolock);
error2 = xfs_fsync(xip); error2 = xfs_fsync(ip);
if (!error) if (!error)
error = error2; error = error2;
} }
out_unlock_internal: out_unlock_internal:
if (xip->i_new_size) { if (ip->i_new_size) {
xfs_ilock(xip, XFS_ILOCK_EXCL); xfs_ilock(ip, XFS_ILOCK_EXCL);
xip->i_new_size = 0; ip->i_new_size = 0;
/* /*
* If this was a direct or synchronous I/O that failed (such * 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 * as ENOSPC) then part of the I/O may have been written to
@ -756,89 +771,17 @@ write_retry:
* file size may have been adjusted beyond the in-memory file * file size may have been adjusted beyond the in-memory file
* size and now needs to be truncated back. * size and now needs to be truncated back.
*/ */
if (xip->i_d.di_size > xip->i_size) if (ip->i_d.di_size > ip->i_size)
xip->i_d.di_size = xip->i_size; ip->i_d.di_size = ip->i_size;
xfs_iunlock(xip, XFS_ILOCK_EXCL); xfs_iunlock(ip, XFS_ILOCK_EXCL);
} }
xfs_iunlock(xip, iolock); xfs_iunlock(ip, iolock);
out_unlock_mutex: out_unlock_mutex:
if (need_i_mutex) if (need_i_mutex)
mutex_unlock(&inode->i_mutex); mutex_unlock(&inode->i_mutex);
return -error; return -error;
} }
STATIC ssize_t
xfs_file_aio_read(
struct kiocb *iocb,
const struct iovec *iov,
unsigned long nr_segs,
loff_t pos)
{
struct file *file = iocb->ki_filp;
int ioflags = 0;
BUG_ON(iocb->ki_pos != pos);
if (unlikely(file->f_flags & O_DIRECT))
ioflags |= IO_ISDIRECT;
if (file->f_mode & FMODE_NOCMTIME)
ioflags |= IO_INVIS;
return xfs_read(XFS_I(file->f_path.dentry->d_inode), iocb, iov,
nr_segs, &iocb->ki_pos, ioflags);
}
STATIC ssize_t
xfs_file_aio_write(
struct kiocb *iocb,
const struct iovec *iov,
unsigned long nr_segs,
loff_t pos)
{
struct file *file = iocb->ki_filp;
int ioflags = 0;
BUG_ON(iocb->ki_pos != pos);
if (unlikely(file->f_flags & O_DIRECT))
ioflags |= IO_ISDIRECT;
if (file->f_mode & FMODE_NOCMTIME)
ioflags |= IO_INVIS;
return xfs_write(XFS_I(file->f_mapping->host), iocb, iov, nr_segs,
&iocb->ki_pos, ioflags);
}
STATIC ssize_t
xfs_file_splice_read(
struct file *infilp,
loff_t *ppos,
struct pipe_inode_info *pipe,
size_t len,
unsigned int flags)
{
int ioflags = 0;
if (infilp->f_mode & FMODE_NOCMTIME)
ioflags |= IO_INVIS;
return xfs_splice_read(XFS_I(infilp->f_path.dentry->d_inode),
infilp, ppos, pipe, len, flags, ioflags);
}
STATIC ssize_t
xfs_file_splice_write(
struct pipe_inode_info *pipe,
struct file *outfilp,
loff_t *ppos,
size_t len,
unsigned int flags)
{
int ioflags = 0;
if (outfilp->f_mode & FMODE_NOCMTIME)
ioflags |= IO_INVIS;
return xfs_splice_write(XFS_I(outfilp->f_path.dentry->d_inode),
pipe, outfilp, ppos, len, flags, ioflags);
}
STATIC int STATIC int
xfs_file_open( xfs_file_open(
struct inode *inode, struct inode *inode,