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vfs: export remap and write check helpers

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Export these functions so that the next patch can use them to check the
file ranges being passed to the XFS_IOC_EXCHANGE_RANGE operation.

Cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2024-04-15 14:54:13 -07:00
parent 15f78aa3eb
commit 5b9932f600
3 changed files with 4 additions and 2 deletions
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1
fs/read_write.c
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@ -1667,6 +1667,7 @@ int generic_write_check_limits(struct file *file, loff_t pos, loff_t *count)
return 0; return 0;
} }
EXPORT_SYMBOL_GPL(generic_write_check_limits);
/* Like generic_write_checks(), but takes size of write instead of iter. */ /* Like generic_write_checks(), but takes size of write instead of iter. */
int generic_write_checks_count(struct kiocb *iocb, loff_t *count) int generic_write_checks_count(struct kiocb *iocb, loff_t *count)

4
fs/remap_range.c
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@ -99,8 +99,7 @@ static int generic_remap_checks(struct file *file_in, loff_t pos_in,
return 0; return 0;
} }
static int remap_verify_area(struct file *file, loff_t pos, loff_t len, int remap_verify_area(struct file *file, loff_t pos, loff_t len, bool write)
bool write)
{ {
int mask = write ? MAY_WRITE : MAY_READ; int mask = write ? MAY_WRITE : MAY_READ;
loff_t tmp; loff_t tmp;
@ -118,6 +117,7 @@ static int remap_verify_area(struct file *file, loff_t pos, loff_t len,
return fsnotify_file_area_perm(file, mask, &pos, len); return fsnotify_file_area_perm(file, mask, &pos, len);
} }
EXPORT_SYMBOL_GPL(remap_verify_area);
/* /*
* Ensure that we don't remap a partial EOF block in the middle of something * Ensure that we don't remap a partial EOF block in the middle of something

1
include/linux/fs.h
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@ -2119,6 +2119,7 @@ extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
extern ssize_t vfs_copy_file_range(struct file *, loff_t , struct file *, extern ssize_t vfs_copy_file_range(struct file *, loff_t , struct file *,
loff_t, size_t, unsigned int); loff_t, size_t, unsigned int);
int remap_verify_area(struct file *file, loff_t pos, loff_t len, bool write);
int __generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, int __generic_remap_file_range_prep(struct file *file_in, loff_t pos_in,
struct file *file_out, loff_t pos_out, struct file *file_out, loff_t pos_out,
loff_t *len, unsigned int remap_flags, loff_t *len, unsigned int remap_flags,