Hi Jaegeuk, > -----Original Message----- > From: Jaegeuk Kim [mailto:jaegeuk@xxxxxxxxxx] > Sent: Tuesday, December 29, 2015 7:32 AM > To: linux-kernel@xxxxxxxxxxxxxxx; linux-fsdevel@xxxxxxxxxxxxxxx; > linux-f2fs-devel@xxxxxxxxxxxxxxxxxxxxx > Cc: Jaegeuk Kim > Subject: [f2fs-dev] [PATCH 3/3] f2fs: load largest extent all the time > > Otherwise, we can get mismatched largest extent information. > > One example is: > 1. mount f2fs w/ extent_cache > 2. make a small extent > 3. umount > 4. mount f2fs w/o extent_cache > 5. update the largest extent > 6. umount > 7. mount f2fs w/ extent_cache > 8. get the old extent made by #2 Good catch! It's a pity to drop it since it may provide some help if we can reuse it. Thanks, > > Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx> > --- > fs/f2fs/extent_cache.c | 18 +++++++++++++----- > fs/f2fs/f2fs.h | 2 +- > fs/f2fs/inode.c | 3 ++- > 3 files changed, 16 insertions(+), 7 deletions(-) > > diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c > index e7b6548..23e7c82 100644 > --- a/fs/f2fs/extent_cache.c > +++ b/fs/f2fs/extent_cache.c > @@ -166,20 +166,27 @@ static void __drop_largest_extent(struct inode *inode, > largest->len = 0; > } > > -void f2fs_init_extent_tree(struct inode *inode, struct f2fs_extent *i_ext) > +/* return true, if inode page is changed */ > +bool f2fs_init_extent_tree(struct inode *inode, struct f2fs_extent *i_ext) > { > struct f2fs_sb_info *sbi = F2FS_I_SB(inode); > struct extent_tree *et; > struct extent_node *en; > struct extent_info ei; > > - if (!f2fs_may_extent_tree(inode)) > - return; > + if (!f2fs_may_extent_tree(inode)) { > + /* drop largest extent */ > + if (i_ext && i_ext->len) { > + i_ext->len = 0; > + return true; > + } > + return false; > + } > > et = __grab_extent_tree(inode); > > - if (!i_ext || le32_to_cpu(i_ext->len) < F2FS_MIN_EXTENT_LEN) > - return; > + if (!i_ext || !i_ext->len) > + return false; > > set_extent_info(&ei, le32_to_cpu(i_ext->fofs), > le32_to_cpu(i_ext->blk), le32_to_cpu(i_ext->len)); > @@ -196,6 +203,7 @@ void f2fs_init_extent_tree(struct inode *inode, struct f2fs_extent *i_ext) > } > out: > write_unlock(&et->lock); > + return false; > } > > static bool f2fs_lookup_extent_tree(struct inode *inode, pgoff_t pgofs, > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h > index e04b2be..a339508 100644 > --- a/fs/f2fs/f2fs.h > +++ b/fs/f2fs/f2fs.h > @@ -2083,7 +2083,7 @@ void f2fs_leave_shrinker(struct f2fs_sb_info *); > * extent_cache.c > */ > unsigned int f2fs_shrink_extent_tree(struct f2fs_sb_info *, int); > -void f2fs_init_extent_tree(struct inode *, struct f2fs_extent *); > +bool f2fs_init_extent_tree(struct inode *, struct f2fs_extent *); > unsigned int f2fs_destroy_extent_node(struct inode *); > void f2fs_destroy_extent_tree(struct inode *); > bool f2fs_lookup_extent_cache(struct inode *, pgoff_t, struct extent_info *); > diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c > index ec3fb32..e955008 100644 > --- a/fs/f2fs/inode.c > +++ b/fs/f2fs/inode.c > @@ -138,7 +138,8 @@ static int do_read_inode(struct inode *inode) > fi->i_pino = le32_to_cpu(ri->i_pino); > fi->i_dir_level = ri->i_dir_level; > > - f2fs_init_extent_tree(inode, &ri->i_ext); > + if (f2fs_init_extent_tree(inode, &ri->i_ext)) > + set_page_dirty(node_page); > > get_inline_info(fi, ri); > > -- > 2.5.4 (Apple Git-61) > > > ------------------------------------------------------------------------------ > _______________________________________________ > Linux-f2fs-devel mailing list > Linux-f2fs-devel@xxxxxxxxxxxxxxxxxxxxx > https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
