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author | Al Viro <viro@zeniv.linux.org.uk> | 2015-04-09 19:55:47 +0300 |
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committer | Al Viro <viro@zeniv.linux.org.uk> | 2015-04-12 05:30:21 +0300 |
commit | 3309dd04cbcd2cdad168485af5cf3576b5051e49 (patch) | |
tree | 3e01f865306dee01b31f34c9e7e819a5f42a4087 /mm/filemap.c | |
parent | 90320251db0fe3d05f2b10686ec936c7d6ecd99a (diff) | |
download | linux-3309dd04cbcd2cdad168485af5cf3576b5051e49.tar.xz |
switch generic_write_checks() to iocb and iter
... returning -E... upon error and amount of data left in iter after
(possible) truncation upon success. Note, that normal case gives
a non-zero (positive) return value, so any tests for != 0 _must_ be
updated.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Conflicts:
fs/ext4/file.c
Diffstat (limited to 'mm/filemap.c')
-rw-r--r-- | mm/filemap.c | 44 |
1 files changed, 19 insertions, 25 deletions
diff --git a/mm/filemap.c b/mm/filemap.c index dfc573c6ec25..243997a26e7c 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) { |