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author | Miao Xie <miaoxie@huawei.com> | 2017-08-06 00:40:01 -0400 |
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committer | Theodore Ts'o <tytso@mit.edu> | 2017-08-06 00:40:01 -0400 |
commit | cf0a5e818fe216dbdf5da4e829e157d27ebfc8a4 (patch) | |
tree | 2bfe8893f6a5c206521d2cc934015fba5baba9cb /fs | |
parent | 3b10fdc6d8bd048f4fb14af5eda2051ace7b8b16 (diff) | |
download | lwn-cf0a5e818fe216dbdf5da4e829e157d27ebfc8a4.tar.gz lwn-cf0a5e818fe216dbdf5da4e829e157d27ebfc8a4.zip |
ext4: restructure ext4_expand_extra_isize
Current ext4_expand_extra_isize just tries to expand extra isize, if
someone is holding xattr lock or some check fails, it will give up.
So rename its name to ext4_try_to_expand_extra_isize.
Besides that, we clean up unnecessary check and move some relative checks
into it.
Signed-off-by: Miao Xie <miaoxie@huawei.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Wang Shilong <wshilong@ddn.com>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/ext4/inode.c | 67 | ||||
-rw-r--r-- | fs/ext4/xattr.c | 9 |
2 files changed, 36 insertions, 40 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 5dabbf276651..713b67e85f73 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -5706,21 +5706,35 @@ ext4_reserve_inode_write(handle_t *handle, struct inode *inode, * Expand an inode by new_extra_isize bytes. * Returns 0 on success or negative error number on failure. */ -static int ext4_expand_extra_isize(struct inode *inode, - unsigned int new_extra_isize, - struct ext4_iloc iloc, - handle_t *handle) +static int ext4_try_to_expand_extra_isize(struct inode *inode, + unsigned int new_extra_isize, + struct ext4_iloc iloc, + handle_t *handle) { struct ext4_inode *raw_inode; struct ext4_xattr_ibody_header *header; int no_expand; int error; - if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) - return 0; + if (ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND)) + return -EOVERFLOW; + + /* + * In nojournal mode, we can immediately attempt to expand + * the inode. When journaled, we first need to obtain extra + * buffer credits since we may write into the EA block + * with this same handle. If journal_extend fails, then it will + * only result in a minor loss of functionality for that inode. + * If this is felt to be critical, then e2fsck should be run to + * force a large enough s_min_extra_isize. + */ + if (ext4_handle_valid(handle) && + jbd2_journal_extend(handle, + EXT4_DATA_TRANS_BLOCKS(inode->i_sb)) != 0) + return -ENOSPC; if (ext4_write_trylock_xattr(inode, &no_expand) == 0) - return 0; + return -EBUSY; raw_inode = ext4_raw_inode(&iloc); @@ -5747,6 +5761,7 @@ static int ext4_expand_extra_isize(struct inode *inode, no_expand = 1; } ext4_write_unlock_xattr(inode, &no_expand); + return error; } @@ -5767,44 +5782,18 @@ int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode) { struct ext4_iloc iloc; struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); - static unsigned int mnt_count; - int err, ret; + int err; might_sleep(); trace_ext4_mark_inode_dirty(inode, _RET_IP_); err = ext4_reserve_inode_write(handle, inode, &iloc); if (err) return err; - if (EXT4_I(inode)->i_extra_isize < sbi->s_want_extra_isize && - !ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND)) { - /* - * In nojournal mode, we can immediately attempt to expand - * the inode. When journaled, we first need to obtain extra - * buffer credits since we may write into the EA block - * with this same handle. If journal_extend fails, then it will - * only result in a minor loss of functionality for that inode. - * If this is felt to be critical, then e2fsck should be run to - * force a large enough s_min_extra_isize. - */ - if (!ext4_handle_valid(handle) || - jbd2_journal_extend(handle, - EXT4_DATA_TRANS_BLOCKS(inode->i_sb)) == 0) { - ret = ext4_expand_extra_isize(inode, - sbi->s_want_extra_isize, - iloc, handle); - if (ret) { - if (mnt_count != - le16_to_cpu(sbi->s_es->s_mnt_count)) { - ext4_warning(inode->i_sb, - "Unable to expand inode %lu. Delete" - " some EAs or run e2fsck.", - inode->i_ino); - mnt_count = - le16_to_cpu(sbi->s_es->s_mnt_count); - } - } - } - } + + if (EXT4_I(inode)->i_extra_isize < sbi->s_want_extra_isize) + ext4_try_to_expand_extra_isize(inode, sbi->s_want_extra_isize, + iloc, handle); + return ext4_mark_iloc_dirty(handle, inode, &iloc); } diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c index 862ba3891398..7f5f4b63782b 100644 --- a/fs/ext4/xattr.c +++ b/fs/ext4/xattr.c @@ -2638,12 +2638,14 @@ int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, { struct ext4_xattr_ibody_header *header; struct buffer_head *bh = NULL; + struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); + static unsigned int mnt_count; size_t min_offs; size_t ifree, bfree; int total_ino; void *base, *end; int error = 0, tried_min_extra_isize = 0; - int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize); + int s_min_extra_isize = le16_to_cpu(sbi->s_es->s_min_extra_isize); int isize_diff; /* How much do we need to grow i_extra_isize */ retry: @@ -2731,6 +2733,11 @@ out: cleanup: brelse(bh); + if (mnt_count != le16_to_cpu(sbi->s_es->s_mnt_count)) { + ext4_warning(inode->i_sb, "Unable to expand inode %lu. Delete some EAs or run e2fsck.", + inode->i_ino); + mnt_count = le16_to_cpu(sbi->s_es->s_mnt_count); + } return error; } |