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| author | Eric Sandeen <sandeen@redhat.com> | 2008-01-28 23:58:27 -0500 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2008-01-28 23:58:27 -0500 |
| commit | e2b4657453c0d5571bd3c7256585c486ed42d364 (patch) | |
| tree | 5b8ab501cdf5fa7427ef32440ace56eac72e9ecf /fs/ext4/file.c | |
| parent | 19295529db35381d46dbaf246f69b4e3b3393996 (diff) | |
| download | kernel-crypto-e2b4657453c0d5571bd3c7256585c486ed42d364.tar.gz kernel-crypto-e2b4657453c0d5571bd3c7256585c486ed42d364.tar.xz kernel-crypto-e2b4657453c0d5571bd3c7256585c486ed42d364.zip | |
ext4: store maxbytes for bitmapped files and return EFBIG as appropriate
Calculate & store the max offset for bitmapped files, and
catch too-large seeks, truncates, and writes in ext4, shortening
or rejecting as appropriate.
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Diffstat (limited to 'fs/ext4/file.c')
| -rw-r--r-- | fs/ext4/file.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/fs/ext4/file.c b/fs/ext4/file.c index 1a81cd66d63..a6b2aa14626 100644 --- a/fs/ext4/file.c +++ b/fs/ext4/file.c @@ -56,8 +56,25 @@ ext4_file_write(struct kiocb *iocb, const struct iovec *iov, ssize_t ret; int err; - ret = generic_file_aio_write(iocb, iov, nr_segs, pos); + /* + * If we have encountered a bitmap-format file, the size limit + * is smaller than s_maxbytes, which is for extent-mapped files. + */ + + if (!(EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL)) { + struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); + size_t length = iov_length(iov, nr_segs); + if (pos > sbi->s_bitmap_maxbytes) + return -EFBIG; + + if (pos + length > sbi->s_bitmap_maxbytes) { + nr_segs = iov_shorten((struct iovec *)iov, nr_segs, + sbi->s_bitmap_maxbytes - pos); + } + } + + ret = generic_file_aio_write(iocb, iov, nr_segs, pos); /* * Skip flushing if there was an error, or if nothing was written. */ |