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-rw-r--r--mm/filemap.c44
1 files changed, 19 insertions, 25 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index dfc573c..243997a 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2260,36 +2260,38 @@ EXPORT_SYMBOL(read_cache_page_gfp);
* Returns appropriate error code that caller should return or
* zero in case that write should be allowed.
*/
-inline int generic_write_checks(struct file *file, loff_t *pos, size_t *count)
+inline ssize_t generic_write_checks(struct kiocb *iocb, struct iov_iter *from)
{
+ struct file *file = iocb->ki_filp;
struct inode *inode = file->f_mapping->host;
unsigned long limit = rlimit(RLIMIT_FSIZE);
+ loff_t pos;
- if (unlikely(*pos < 0))
- return -EINVAL;
+ if (!iov_iter_count(from))
+ return 0;
/* FIXME: this is for backwards compatibility with 2.4 */
if (file->f_flags & O_APPEND)
- *pos = i_size_read(inode);
+ iocb->ki_pos = i_size_read(inode);
+
+ pos = iocb->ki_pos;
if (limit != RLIM_INFINITY) {
- if (*pos >= limit) {
+ if (iocb->ki_pos >= limit) {
send_sig(SIGXFSZ, current, 0);
return -EFBIG;
}
- if (*count > limit - (typeof(limit))*pos)
- *count = limit - (typeof(limit))*pos;
+ iov_iter_truncate(from, limit - (unsigned long)pos);
}
/*
* LFS rule
*/
- if (unlikely(*pos + *count > MAX_NON_LFS &&
+ if (unlikely(pos + iov_iter_count(from) > MAX_NON_LFS &&
!(file->f_flags & O_LARGEFILE))) {
- if (*pos >= MAX_NON_LFS)
+ if (pos >= MAX_NON_LFS)
return -EFBIG;
- if (*count > MAX_NON_LFS - (unsigned long)*pos)
- *count = MAX_NON_LFS - (unsigned long)*pos;
+ iov_iter_truncate(from, MAX_NON_LFS - (unsigned long)pos);
}
/*
@@ -2299,16 +2301,11 @@ inline int generic_write_checks(struct file *file, loff_t *pos, size_t *count)
* exceeded without writing data we send a signal and return EFBIG.
* Linus frestrict idea will clean these up nicely..
*/
- if (unlikely(*pos >= inode->i_sb->s_maxbytes)) {
- if (*count || *pos > inode->i_sb->s_maxbytes) {
- return -EFBIG;
- }
- /* zero-length writes at ->s_maxbytes are OK */
- }
+ if (unlikely(pos >= inode->i_sb->s_maxbytes))
+ return -EFBIG;
- if (unlikely(*pos + *count > inode->i_sb->s_maxbytes))
- *count = inode->i_sb->s_maxbytes - *pos;
- return 0;
+ iov_iter_truncate(from, inode->i_sb->s_maxbytes - pos);
+ return iov_iter_count(from);
}
EXPORT_SYMBOL(generic_write_checks);
@@ -2618,14 +2615,11 @@ ssize_t generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_mapping->host;
ssize_t ret;
- size_t count = iov_iter_count(from);
mutex_lock(&inode->i_mutex);
- ret = generic_write_checks(file, &iocb->ki_pos, &count);
- if (!ret && count) {
- iov_iter_truncate(from, count);
+ ret = generic_write_checks(iocb, from);
+ if (ret > 0)
ret = __generic_file_write_iter(iocb, from);
- }
mutex_unlock(&inode->i_mutex);
if (ret > 0) {
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