Hi Chao, On Tue, Dec 29, 2015 at 05:23:55PM +0800, Chao Yu wrote: > 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. Indeed, but I expect it's not a common case. Thanks, > > 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
