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Message-Id: <20220721060246.1696852-3-harshadshirwadkar@gmail.com> Date: Thu, 21 Jul 2022 06:02:40 +0000 From: Harshad Shirwadkar <harshadshirwadkar@...il.com> To: linux-ext4@...r.kernel.org Cc: tytso@....edu, Harshad Shirwadkar <harshadshirwadkar@...il.com> Subject: [RFC PATCH v4 2/8] ext4: for committing inode, make ext4_fc_track_inode wait If the inode that's being requested to track using ext4_fc_track_inode is being committed, then wait until the inode finishes the commit. Also, add calls to ext4_fc_track_inode at the right places. With this patch, now calling ext4_reserve_inode_write() results in inode being tracked for next fast commit. A subtle lock ordering requirement with i_data_sem (which is documented in the code) requires that ext4_fc_track_inode() be called before grabbing i_data_sem. So, this patch also adds explicit ext4_fc_track_inode() calls in places where i_data_sem grabbed. Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@...il.com> --- fs/ext4/fast_commit.c | 30 ++++++++++++++++++++++++++++++ fs/ext4/inline.c | 3 +++ fs/ext4/inode.c | 5 ++++- 3 files changed, 37 insertions(+), 1 deletion(-) diff --git a/fs/ext4/fast_commit.c b/fs/ext4/fast_commit.c index 8d6d5155a646..4d2384adcbb0 100644 --- a/fs/ext4/fast_commit.c +++ b/fs/ext4/fast_commit.c @@ -574,8 +574,14 @@ static int __track_inode(struct inode *inode, void *arg, bool update) return 0; } +/* + * Track inode as part of the next fast commit. If the inode is being + * committed, this function will wait for the commit to finish. + */ void ext4_fc_track_inode(handle_t *handle, struct inode *inode) { + struct ext4_inode_info *ei = EXT4_I(inode); + wait_queue_head_t *wq; struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); int ret; @@ -595,6 +601,30 @@ void ext4_fc_track_inode(handle_t *handle, struct inode *inode) if (ext4_test_mount_flag(inode->i_sb, EXT4_MF_FC_INELIGIBLE)) return; + if (!test_opt2(inode->i_sb, JOURNAL_FAST_COMMIT) || + (EXT4_SB(inode->i_sb)->s_mount_state & EXT4_FC_REPLAY) || + ext4_test_mount_flag(inode->i_sb, EXT4_MF_FC_INELIGIBLE) || + !list_empty(&ei->i_fc_list)) + return; + + while (ext4_test_inode_state(inode, EXT4_STATE_FC_COMMITTING)) { +#if (BITS_PER_LONG < 64) + DEFINE_WAIT_BIT(wait, &ei->i_state_flags, + EXT4_STATE_FC_COMMITTING); + wq = bit_waitqueue(&ei->i_state_flags, + EXT4_STATE_FC_COMMITTING); +#else + DEFINE_WAIT_BIT(wait, &ei->i_flags, + EXT4_STATE_FC_COMMITTING); + wq = bit_waitqueue(&ei->i_flags, + EXT4_STATE_FC_COMMITTING); +#endif + prepare_to_wait(wq, &wait.wq_entry, TASK_UNINTERRUPTIBLE); + if (ext4_test_inode_state(inode, EXT4_STATE_FC_COMMITTING)) + schedule(); + finish_wait(wq, &wait.wq_entry); + } + ret = ext4_fc_track_template(handle, inode, __track_inode, NULL, 1); trace_ext4_fc_track_inode(handle, inode, ret); } diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c index cff52ff6549d..7f5edfb34095 100644 --- a/fs/ext4/inline.c +++ b/fs/ext4/inline.c @@ -586,6 +586,7 @@ static int ext4_convert_inline_data_to_extent(struct address_space *mapping, goto out; } + ext4_fc_track_inode(handle, inode); ret = ext4_destroy_inline_data_nolock(handle, inode); if (ret) goto out; @@ -686,6 +687,7 @@ int ext4_try_to_write_inline_data(struct address_space *mapping, goto convert; } + ext4_fc_track_inode(handle, inode); ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh, EXT4_JTR_NONE); if (ret) @@ -964,6 +966,7 @@ int ext4_da_write_inline_data_begin(struct address_space *mapping, if (ret < 0) goto out_release_page; } + ext4_fc_track_inode(handle, inode); ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh, EXT4_JTR_NONE); if (ret) diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 84c0eb55071d..f3de6748a96b 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -627,6 +627,7 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode, */ map->m_flags &= ~EXT4_MAP_FLAGS; + ext4_fc_track_inode(handle, inode); /* * New blocks allocate and/or writing to unwritten extent * will possibly result in updating i_data, so we take @@ -4076,7 +4077,7 @@ int ext4_punch_hole(struct file *file, loff_t offset, loff_t length) /* If there are blocks to remove, do it */ if (stop_block > first_block) { - + ext4_fc_track_inode(handle, inode); down_write(&EXT4_I(inode)->i_data_sem); ext4_discard_preallocations(inode, 0); @@ -4232,6 +4233,7 @@ int ext4_truncate(struct inode *inode) if (err) goto out_stop; + ext4_fc_track_inode(handle, inode); down_write(&EXT4_I(inode)->i_data_sem); ext4_discard_preallocations(inode, 0); @@ -5752,6 +5754,7 @@ ext4_reserve_inode_write(handle_t *handle, struct inode *inode, brelse(iloc->bh); iloc->bh = NULL; } + ext4_fc_track_inode(handle, inode); } ext4_std_error(inode->i_sb, err); return err; -- 2.37.0.170.g444d1eabd0-goog
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