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[PATCH] Streamline generic_file_* interfaces and filemap cleanups 

This patch cleans up generic_file_*_read/write() interfaces.  Christoph
Hellwig gave me the idea for this clean ups.

In a nutshell, all filesystems should set .aio_read/.aio_write methods and use
do_sync_read/ do_sync_write() as their .read/.write methods.  This allows us
to cleanup all variants of generic_file_* routines.

Final available interfaces:

generic_file_aio_read() - read handler
generic_file_aio_write() - write handler
generic_file_aio_write_nolock() - no lock write handler

__generic_file_aio_write_nolock() - internal worker routine

Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Badari Pulavarty 2006-09-30 23:28:48 -07:00 committed by Linus Torvalds
parent ee0b3e671b
commit 543ade1fc9
27 changed files with 105 additions and 165 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/char/raw.c
View File

@ -238,21 +238,10 @@ out:
return err;
}
static ssize_t raw_file_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
struct iovec local_iov = {
.iov_base = (char __user *)buf,
.iov_len = count
};
return generic_file_write_nolock(file, &local_iov, 1, ppos);
}
static const struct file_operations raw_fops = {
.read = generic_file_read,
.read = do_sync_read,
.aio_read = generic_file_aio_read,
.write = raw_file_write,
.write = do_sync_write,
.aio_write = generic_file_aio_write_nolock,
.open = raw_open,
.release= raw_release,

6
fs/adfs/file.c
View File

@ -27,10 +27,12 @@
const struct file_operations adfs_file_operations = {
.llseek = generic_file_llseek,
.read = generic_file_read,
.read = do_sync_read,
.aio_read = generic_file_aio_read,
.mmap = generic_file_mmap,
.fsync = file_fsync,
.write = generic_file_write,
.write = do_sync_write,
.aio_write = generic_file_aio_write,
.sendfile = generic_file_sendfile,
};

6
fs/affs/file.c
View File

@ -27,8 +27,10 @@ static int affs_file_release(struct inode *inode, struct file *filp);
const struct file_operations affs_file_operations = {
.llseek = generic_file_llseek,
.read = generic_file_read,
.write = generic_file_write,
.read = do_sync_read,
.aio_read = generic_file_aio_read,
.write = do_sync_write,
.aio_write = generic_file_aio_write,
.mmap = generic_file_mmap,
.open = affs_file_open,
.release = affs_file_release,

6
fs/bfs/file.c
View File

@ -19,8 +19,10 @@
const struct file_operations bfs_file_operations = {
.llseek = generic_file_llseek,
.read = generic_file_read,
.write = generic_file_write,
.read = do_sync_read,
.aio_read = generic_file_aio_read,
.write = do_sync_write,
.aio_write = generic_file_aio_write,
.mmap = generic_file_mmap,
.sendfile = generic_file_sendfile,
};

12
fs/block_dev.c
View File

@ -1154,14 +1154,6 @@ static int blkdev_close(struct inode * inode, struct file * filp)
return blkdev_put(bdev);
}
static ssize_t blkdev_file_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
struct iovec local_iov = { .iov_base = (void __user *)buf, .iov_len = count };
return generic_file_write_nolock(file, &local_iov, 1, ppos);
}
static long block_ioctl(struct file *file, unsigned cmd, unsigned long arg)
{
return blkdev_ioctl(file->f_mapping->host, file, cmd, arg);
@ -1181,8 +1173,8 @@ const struct file_operations def_blk_fops = {
.open = blkdev_open,
.release = blkdev_close,
.llseek = block_llseek,
.read = generic_file_read,
.write = blkdev_file_write,
.read = do_sync_read,
.write = do_sync_write,
.aio_read = generic_file_aio_read,
.aio_write = generic_file_aio_write_nolock,
.mmap = generic_file_mmap,

4
fs/ext2/file.c
View File

@ -41,8 +41,8 @@ static int ext2_release_file (struct inode * inode, struct file * filp)
*/
const struct file_operations ext2_file_operations = {
.llseek = generic_file_llseek,
.read = generic_file_read,
.write = generic_file_write,
.read = do_sync_read,
.write = do_sync_write,
.aio_read = generic_file_aio_read,
.aio_write = generic_file_aio_write,
.ioctl = ext2_ioctl,

6
fs/fuse/file.c
View File

@ -753,8 +753,10 @@ static int fuse_file_lock(struct file *file, int cmd, struct file_lock *fl)
static const struct file_operations fuse_file_operations = {
.llseek = generic_file_llseek,
.read = generic_file_read,
.write = generic_file_write,
.read = do_sync_read,
.aio_read = generic_file_aio_read,
.write = do_sync_write,
.aio_write = generic_file_aio_write,
.mmap = fuse_file_mmap,
.open = fuse_open,
.flush = fuse_flush,

6
fs/hfs/inode.c
View File

@ -601,8 +601,10 @@ int hfs_inode_setattr(struct dentry *dentry, struct iattr * attr)
static const struct file_operations hfs_file_operations = {
.llseek = generic_file_llseek,
.read = generic_file_read,
.write = generic_file_write,
.read = do_sync_read,
.aio_read = generic_file_aio_read,
.write = do_sync_write,
.aio_write = generic_file_aio_write,
.mmap = generic_file_mmap,
.sendfile = generic_file_sendfile,
.fsync = file_fsync,

6
fs/hfsplus/inode.c
View File

@ -282,8 +282,10 @@ static struct inode_operations hfsplus_file_inode_operations = {
static const struct file_operations hfsplus_file_operations = {
.llseek = generic_file_llseek,
.read = generic_file_read,
.write = generic_file_write,
.read = do_sync_read,
.aio_read = generic_file_aio_read,
.write = do_sync_write,
.aio_write = generic_file_aio_write,
.mmap = generic_file_mmap,
.sendfile = generic_file_sendfile,
.fsync = file_fsync,

4
fs/hostfs/hostfs_kern.c
View File

@ -385,11 +385,11 @@ int hostfs_fsync(struct file *file, struct dentry *dentry, int datasync)
static const struct file_operations hostfs_file_fops = {
.llseek = generic_file_llseek,
.read = generic_file_read,
.read = do_sync_read,
.sendfile = generic_file_sendfile,
.aio_read = generic_file_aio_read,
.aio_write = generic_file_aio_write,
.write = generic_file_write,
.write = do_sync_write,
.mmap = generic_file_mmap,
.open = hostfs_file_open,
.release = NULL,

6
fs/hpfs/file.c
View File

@ -113,7 +113,7 @@ static ssize_t hpfs_file_write(struct file *file, const char __user *buf,
{
ssize_t retval;
retval = generic_file_write(file, buf, count, ppos);
retval = do_sync_write(file, buf, count, ppos);
if (retval > 0)
hpfs_i(file->f_dentry->d_inode)->i_dirty = 1;
return retval;
@ -122,8 +122,10 @@ static ssize_t hpfs_file_write(struct file *file, const char __user *buf,
const struct file_operations hpfs_file_ops =
{
.llseek = generic_file_llseek,
.read = generic_file_read,
.read = do_sync_read,
.aio_read = generic_file_aio_read,
.write = hpfs_file_write,
.aio_write = generic_file_aio_write,
.mmap = generic_file_mmap,
.release = hpfs_file_release,
.fsync = hpfs_file_fsync,

6
fs/jffs/inode-v23.c
View File

@ -1632,8 +1632,10 @@ static const struct file_operations jffs_file_operations =
{
.open = generic_file_open,
.llseek = generic_file_llseek,
.read = generic_file_read,
.write = generic_file_write,
.read = do_sync_read,
.aio_read = generic_file_aio_read,
.write = do_sync_write,
.aio_write = generic_file_aio_write,
.ioctl = jffs_ioctl,
.mmap = generic_file_readonly_mmap,
.fsync = jffs_fsync,

6
fs/jffs2/file.c
View File

@ -42,8 +42,10 @@ const struct file_operations jffs2_file_operations =
{
.llseek = generic_file_llseek,
.open = generic_file_open,
.read = generic_file_read,
.write = generic_file_write,
.read = do_sync_read,
.aio_read = generic_file_aio_read,
.write = do_sync_write,
.aio_write = generic_file_aio_write,
.ioctl = jffs2_ioctl,
.mmap = generic_file_readonly_mmap,
.fsync = jffs2_fsync,

4
fs/jfs/file.c
View File

@ -103,8 +103,8 @@ struct inode_operations jfs_file_inode_operations = {
const struct file_operations jfs_file_operations = {
.open = jfs_open,
.llseek = generic_file_llseek,
.write = generic_file_write,
.read = generic_file_read,
.write = do_sync_write,
.read = do_sync_read,
.aio_read = generic_file_aio_read,
.aio_write = generic_file_aio_write,
.mmap = generic_file_mmap,

6
fs/minix/file.c
View File

@ -17,8 +17,10 @@ int minix_sync_file(struct file *, struct dentry *, int);
const struct file_operations minix_file_operations = {
.llseek = generic_file_llseek,
.read = generic_file_read,
.write = generic_file_write,
.read = do_sync_read,
.aio_read = generic_file_aio_read,
.write = do_sync_write,
.aio_write = generic_file_aio_write,
.mmap = generic_file_mmap,
.fsync = minix_sync_file,
.sendfile = generic_file_sendfile,

2
fs/ntfs/file.c
View File

@ -2296,7 +2296,7 @@ static int ntfs_file_fsync(struct file *filp, struct dentry *dentry,
const struct file_operations ntfs_file_ops = {
.llseek = generic_file_llseek, /* Seek inside file. */
.read = generic_file_read, /* Read from file. */
.read = do_sync_read, /* Read from file. */
.aio_read = generic_file_aio_read, /* Async read from file. */
#ifdef NTFS_RW
.write = ntfs_file_write, /* Write to file. */

6
fs/qnx4/file.c
View File

@ -22,11 +22,13 @@
const struct file_operations qnx4_file_operations =
{
.llseek = generic_file_llseek,
.read = generic_file_read,
.read = do_sync_read,
.aio_read = generic_file_aio_read,
.mmap = generic_file_mmap,
.sendfile = generic_file_sendfile,
#ifdef CONFIG_QNX4FS_RW
.write = generic_file_write,
.write = do_sync_write,
.aio_write = generic_file_aio_write,
.fsync = qnx4_sync_file,
#endif
};

6
fs/ramfs/file-mmu.c
View File

@ -33,8 +33,10 @@ const struct address_space_operations ramfs_aops = {
};
const struct file_operations ramfs_file_operations = {
.read = generic_file_read,
.write = generic_file_write,
.read = do_sync_read,
.aio_read = generic_file_aio_read,
.write = do_sync_write,
.aio_write = generic_file_aio_write,
.mmap = generic_file_mmap,
.fsync = simple_sync_file,
.sendfile = generic_file_sendfile,

6
fs/ramfs/file-nommu.c
View File

@ -36,8 +36,10 @@ const struct address_space_operations ramfs_aops = {
const struct file_operations ramfs_file_operations = {
.mmap = ramfs_nommu_mmap,
.get_unmapped_area = ramfs_nommu_get_unmapped_area,
.read = generic_file_read,
.write = generic_file_write,
.read = do_sync_read,
.aio_read = generic_file_aio_read,
.write = do_sync_write,
.aio_write = generic_file_aio_write,
.fsync = simple_sync_file,
.sendfile = generic_file_sendfile,
.llseek = generic_file_llseek,

3
fs/read_write.c
View File

@ -22,7 +22,8 @@
const struct file_operations generic_ro_fops = {
.llseek = generic_file_llseek,
.read = generic_file_read,
.read = do_sync_read,
.aio_read = generic_file_aio_read,
.mmap = generic_file_readonly_mmap,
.sendfile = generic_file_sendfile,
};

24
fs/smbfs/file.c
View File

@ -214,13 +214,15 @@ smb_updatepage(struct file *file, struct page *page, unsigned long offset,
}
static ssize_t
smb_file_read(struct file * file, char __user * buf, size_t count, loff_t *ppos)
smb_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
{
struct file * file = iocb->ki_filp;
struct dentry * dentry = file->f_dentry;
ssize_t status;
VERBOSE("file %s/%s, count=%lu@%lu\n", DENTRY_PATH(dentry),
(unsigned long) count, (unsigned long) *ppos);
(unsigned long) iocb->ki_left, (unsigned long) pos);
status = smb_revalidate_inode(dentry);
if (status) {
@ -233,7 +235,7 @@ smb_file_read(struct file * file, char __user * buf, size_t count, loff_t *ppos)
(long)dentry->d_inode->i_size,
dentry->d_inode->i_flags, dentry->d_inode->i_atime);
status = generic_file_read(file, buf, count, ppos);
status = generic_file_aio_read(iocb, iov, nr_segs, pos);
out:
return status;
}
@ -317,14 +319,16 @@ const struct address_space_operations smb_file_aops = {
* Write to a file (through the page cache).
*/
static ssize_t
smb_file_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
smb_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
{
struct file * file = iocb->ki_filp;
struct dentry * dentry = file->f_dentry;
ssize_t result;
VERBOSE("file %s/%s, count=%lu@%lu\n",
DENTRY_PATH(dentry),
(unsigned long) count, (unsigned long) *ppos);
(unsigned long) iocb->ki_left, (unsigned long) pos);
result = smb_revalidate_inode(dentry);
if (result) {
@ -337,8 +341,8 @@ smb_file_write(struct file *file, const char __user *buf, size_t count, loff_t *
if (result)
goto out;
if (count > 0) {
result = generic_file_write(file, buf, count, ppos);
if (iocb->ki_left > 0) {
result = generic_file_aio_write(iocb, iov, nr_segs, pos);
VERBOSE("pos=%ld, size=%ld, mtime=%ld, atime=%ld\n",
(long) file->f_pos, (long) dentry->d_inode->i_size,
dentry->d_inode->i_mtime, dentry->d_inode->i_atime);
@ -402,8 +406,10 @@ smb_file_permission(struct inode *inode, int mask, struct nameidata *nd)
const struct file_operations smb_file_operations =
{
.llseek = remote_llseek,
.read = smb_file_read,
.write = smb_file_write,
.read = do_sync_read,
.aio_read = smb_file_aio_read,
.write = do_sync_write,
.aio_write = smb_file_aio_write,
.ioctl = smb_ioctl,
.mmap = smb_file_mmap,
.open = smb_file_open,

6
fs/sysv/file.c
View File

@ -21,8 +21,10 @@
*/
const struct file_operations sysv_file_operations = {
.llseek = generic_file_llseek,
.read = generic_file_read,
.write = generic_file_write,
.read = do_sync_read,
.aio_read = generic_file_aio_read,
.write = do_sync_write,
.aio_write = generic_file_aio_write,
.mmap = generic_file_mmap,
.fsync = sysv_sync_file,
.sendfile = generic_file_sendfile,

16
fs/udf/file.c
View File

@ -103,19 +103,21 @@ const struct address_space_operations udf_adinicb_aops = {
.commit_write = udf_adinicb_commit_write,
};
static ssize_t udf_file_write(struct file * file, const char __user * buf,
size_t count, loff_t *ppos)
static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t ppos)
{
ssize_t retval;
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_dentry->d_inode;
int err, pos;
size_t count = iocb->ki_left;
if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
{
if (file->f_flags & O_APPEND)
pos = inode->i_size;
else
pos = *ppos;
pos = ppos;
if (inode->i_sb->s_blocksize < (udf_file_entry_alloc_offset(inode) +
pos + count))
@ -136,7 +138,7 @@ static ssize_t udf_file_write(struct file * file, const char __user * buf,
}
}
retval = generic_file_write(file, buf, count, ppos);
retval = generic_file_aio_write(iocb, iov, nr_segs, ppos);
if (retval > 0)
mark_inode_dirty(inode);
@ -249,11 +251,13 @@ static int udf_release_file(struct inode * inode, struct file * filp)
}
const struct file_operations udf_file_operations = {
.read = generic_file_read,
.read = do_sync_read,
.aio_read = generic_file_aio_read,
.ioctl = udf_ioctl,
.open = generic_file_open,
.mmap = generic_file_mmap,
.write = udf_file_write,
.write = do_sync_write,
.aio_write = udf_file_aio_write,
.release = udf_release_file,
.fsync = udf_fsync_file,
.sendfile = generic_file_sendfile,

6
fs/ufs/file.c
View File

@ -53,8 +53,10 @@ static int ufs_sync_file(struct file *file, struct dentry *dentry, int datasync)
const struct file_operations ufs_file_operations = {
.llseek = generic_file_llseek,
.read = generic_file_read,
.write = generic_file_write,
.read = do_sync_read,
.aio_read = generic_file_aio_read,
.write = do_sync_write,
.aio_write = generic_file_aio_write,
.mmap = generic_file_mmap,
.open = generic_file_open,
.fsync = ufs_sync_file,

4
fs/xfs/linux-2.6/xfs_lrw.c
View File

@ -279,7 +279,9 @@ xfs_read(
xfs_rw_enter_trace(XFS_READ_ENTER, &ip->i_iocore,
(void *)iovp, segs, *offset, ioflags);
ret = __generic_file_aio_read(iocb, iovp, segs, offset);
iocb->ki_pos = *offset;
ret = generic_file_aio_read(iocb, iovp, segs, *offset);
if (ret == -EIOCBQUEUED && !(ioflags & IO_ISAIO))
ret = wait_on_sync_kiocb(iocb);
if (ret > 0)

5
include/linux/fs.h
View File

@ -1699,11 +1699,8 @@ extern int generic_file_mmap(struct file *, struct vm_area_struct *);
extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
extern int file_send_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
extern ssize_t generic_file_read(struct file *, char __user *, size_t, loff_t *);
int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk);
extern ssize_t generic_file_write(struct file *, const char __user *, size_t, loff_t *);
extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t);
extern ssize_t __generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t *);
extern ssize_t generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, loff_t);
extern ssize_t generic_file_aio_write_nolock(struct kiocb *, const struct iovec *,
unsigned long, loff_t);
@ -1713,8 +1710,6 @@ extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *,
unsigned long, loff_t, loff_t *, size_t, ssize_t);
extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos);
ssize_t generic_file_write_nolock(struct file *file, const struct iovec *iov,
unsigned long nr_segs, loff_t *ppos);
extern ssize_t generic_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void *);
extern void do_generic_mapping_read(struct address_space *mapping,
struct file_ra_state *, struct file *,

87
mm/filemap.c
View File

@ -1149,13 +1149,14 @@ success:
* that can use the page cache directly.
*/
ssize_t
__generic_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t *ppos)
generic_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
{
struct file *filp = iocb->ki_filp;
ssize_t retval;
unsigned long seg;
size_t count;
loff_t *ppos = &iocb->ki_pos;
count = 0;
for (seg = 0; seg < nr_segs; seg++) {
@ -1179,7 +1180,7 @@ __generic_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
/* coalesce the iovecs and go direct-to-BIO for O_DIRECT */
if (filp->f_flags & O_DIRECT) {
loff_t pos = *ppos, size;
loff_t size;
struct address_space *mapping;
struct inode *inode;
@ -1223,32 +1224,8 @@ __generic_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
out:
return retval;
}
EXPORT_SYMBOL(__generic_file_aio_read);
ssize_t
generic_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
{
BUG_ON(iocb->ki_pos != pos);
return __generic_file_aio_read(iocb, iov, nr_segs, &iocb->ki_pos);
}
EXPORT_SYMBOL(generic_file_aio_read);
ssize_t
generic_file_read(struct file *filp, char __user *buf, size_t count, loff_t *ppos)
{
struct iovec local_iov = { .iov_base = buf, .iov_len = count };
struct kiocb kiocb;
ssize_t ret;
init_sync_kiocb(&kiocb, filp);
ret = __generic_file_aio_read(&kiocb, &local_iov, 1, ppos);
if (-EIOCBQUEUED == ret)
ret = wait_on_sync_kiocb(&kiocb);
return ret;
}
EXPORT_SYMBOL(generic_file_read);
int file_send_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size)
{
ssize_t written;
@ -2339,38 +2316,6 @@ ssize_t generic_file_aio_write_nolock(struct kiocb *iocb,
}
EXPORT_SYMBOL(generic_file_aio_write_nolock);
static ssize_t
__generic_file_write_nolock(struct file *file, const struct iovec *iov,
unsigned long nr_segs, loff_t *ppos)
{
struct kiocb kiocb;
ssize_t ret;
init_sync_kiocb(&kiocb, file);
kiocb.ki_pos = *ppos;
ret = __generic_file_aio_write_nolock(&kiocb, iov, nr_segs, ppos);
if (-EIOCBQUEUED == ret)
ret = wait_on_sync_kiocb(&kiocb);
return ret;
}
ssize_t
generic_file_write_nolock(struct file *file, const struct iovec *iov,
unsigned long nr_segs, loff_t *ppos)
{
struct kiocb kiocb;
ssize_t ret;
init_sync_kiocb(&kiocb, file);
kiocb.ki_pos = *ppos;
ret = generic_file_aio_write_nolock(&kiocb, iov, nr_segs, *ppos);
if (-EIOCBQUEUED == ret)
ret = wait_on_sync_kiocb(&kiocb);
*ppos = kiocb.ki_pos;
return ret;
}
EXPORT_SYMBOL(generic_file_write_nolock);
ssize_t generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
{
@ -2397,30 +2342,6 @@ ssize_t generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
}
EXPORT_SYMBOL(generic_file_aio_write);
ssize_t generic_file_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
struct address_space *mapping = file->f_mapping;
struct inode *inode = mapping->host;
ssize_t ret;
struct iovec local_iov = { .iov_base = (void __user *)buf,
.iov_len = count };
mutex_lock(&inode->i_mutex);
ret = __generic_file_write_nolock(file, &local_iov, 1, ppos);
mutex_unlock(&inode->i_mutex);
if (ret > 0 && ((file->f_flags & O_SYNC) || IS_SYNC(inode))) {
ssize_t err;
err = sync_page_range(inode, mapping, *ppos - ret, ret);
if (err < 0)
ret = err;
}
return ret;
}
EXPORT_SYMBOL(generic_file_write);
/*
* Called under i_mutex for writes to S_ISREG files. Returns -EIO if something
* went wrong during pagecache shootdown.