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Add SEEK_DATA/SEEK_HOLE to lseek()/llseek()

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The approach taken was the rework zfs_holey() as little as
possible and then just wrap the code as needed to ensure
correct locking and error handling.

Tested with xfstests 285 and 286.  All tests pass except for
7-9 of 285 which try to reserve blocks first via fallocate(2)
and fail because fallocate(2) is not yet supported.

Note that the filp->f_lock spinlock did not exist prior to
Linux 2.6.30, but we avoid the need for autotools check by
virtue of the fact that SEEK_DATA/SEEK_HOLE support was not
added until Linux 3.1.

An autoconf check was added for lseek_execute() which is
currently a private function but the expectation is that it
will be exported perhaps as early as Linux 3.11.

Reviewed-by: Richard Laager <rlaager@wiktel.com>
Signed-off-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1384
This commit is contained in:
Li Dongyang
2013-06-13 13:51:09 -04:00
committed by Brian Behlendorf
parent cf91b2b6b2
commit 802e7b5feb
6 changed files with 97 additions and 11 deletions
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include/linux/vfs_compat.h
+22
View File
@@ -152,4 +152,26 @@ typedef int zpl_umode_t;
#define ZFS_IOC_GETFLAGS FS_IOC_GETFLAGS
#define ZFS_IOC_SETFLAGS FS_IOC_SETFLAGS
#if defined(SEEK_HOLE) && defined(SEEK_DATA) && !defined(HAVE_LSEEK_EXECUTE)
static inline loff_t
lseek_execute(struct file *filp, struct inode *inode,
loff_t offset, loff_t maxsize)
{
if (offset < 0 && !(filp->f_mode & FMODE_UNSIGNED_OFFSET))
return (-EINVAL);
if (offset > maxsize)
return (-EINVAL);
if (offset != filp->f_pos) {
spin_lock(&filp->f_lock);
filp->f_pos = offset;
filp->f_version = 0;
spin_unlock(&filp->f_lock);
}
return (offset);
}
#endif /* SEEK_HOLE && SEEK_DATA && !HAVE_LSEEK_EXECUTE */
#endif /* _ZFS_VFS_H */