| Message ID | 549284AE.9020201@jp.fujitsu.com (mailing list archive) |
|---|---|
| State | Under Review |
| Headers | show |
On Thu, 2014-12-18 at 16:39 +0900, Satoru Takeuchi wrote: > From: Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com> > > When "/" is Btrfs, "btrfs property <subcommand> /" regards it > as non-root by mistake. > > check_is_root() regards @object as a file system root if > the following two conditions are satisfied. > > a) Both @object and its parent directory are Btrfs object > (file system root, subvolume, inode, and device > used for Btrfs). > b) fsid of the above mentioned two objects are different. > > It doesn't work if @object is "/" because, in this case, > fsid of "/" and its parent (it's also "/"), are the same. > > * Test environment > > Two Btrfs file system (not subvolume) "/" and "/home/sat/mnt". > > * How to reproduce > > Submit "btrfs prop get" against the above mentioned file systems. > > * Test Result > > ** Actual result (without my patch) > > ========================== > # btrfs prop get /home/sat/mnt/ > ro=false > label= # label is displayed because it's a file system root > # btrfs prop get / > ro=false # label is not displayed even if it's a file system root > ========================== > ** Expected result (with my patch) > > ========================== > # ./btrfs-new prop get btrfs-auto-test/ > # ./btrfs-new prop get /home/sat/mnt/ > ro=false > label= > # ./btrfs-new prop get / > ro=false > label=foo # label is displayed > =========================== > > Signed-off-by: Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com> > Reported-by: Naohiro Aota <naota@elisp.net> Looks good to me. Reviewed-by: Gui Hecheng <guihc.fnst@cn.fujitsu.com> Thanks, Gui > --- > changelog > v2: Return a correct error code when realpath() fails. > Thank you Gui Hecheng for pointing my mistake out. > https://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg40204.html > --- > cmds-property.c | 14 +++++++++++++- > 1 file changed, 13 insertions(+), 1 deletion(-) > > diff --git a/cmds-property.c b/cmds-property.c > index a764293..6501338 100644 > --- a/cmds-property.c > +++ b/cmds-property.c > @@ -124,7 +124,18 @@ static int check_is_root(const char *object) > int ret; > u8 fsid[BTRFS_FSID_SIZE]; > u8 fsid2[BTRFS_FSID_SIZE]; > - char *tmp; > + char *tmp = NULL; > + char *rp; > + > + rp = realpath(object, NULL); > + if (!rp) { > + ret = -errno; > + goto out; > + } > + if (!strcmp(rp, "/")) { > + ret = 0; > + goto out; > + } > > tmp = malloc(strlen(object) + 5); > if (!tmp) { > @@ -165,6 +176,7 @@ static int check_is_root(const char *object) > > out: > free(tmp); > + free(rp); > return ret; > } > -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
========================== # btrfs prop get /home/sat/mnt/ ro=false label= # label is displayed because it's a file system root # btrfs prop get / ro=false # label is not displayed even if it's a file system root ========================== ** Expected result (with my patch) ========================== # ./btrfs-new prop get btrfs-auto-test/ # ./btrfs-new prop get /home/sat/mnt/ ro=false label= # ./btrfs-new prop get / ro=false label=foo # label is displayed =========================== Signed-off-by: Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com> Reported-by: Naohiro Aota <naota@elisp.net> --- changelog v2: Return a correct error code when realpath() fails. Thank you Gui Hecheng for pointing my mistake out. https://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg40204.html --- cmds-property.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/cmds-property.c b/cmds-property.c index a764293..6501338 100644 --- a/cmds-property.c +++ b/cmds-property.c @@ -124,7 +124,18 @@ static int check_is_root(const char *object) int ret; u8 fsid[BTRFS_FSID_SIZE]; u8 fsid2[BTRFS_FSID_SIZE]; - char *tmp; + char *tmp = NULL; + char *rp; + + rp = realpath(object, NULL); + if (!rp) { + ret = -errno; + goto out; + } + if (!strcmp(rp, "/")) { + ret = 0; + goto out; + } tmp = malloc(strlen(object) + 5); if (!tmp) { @@ -165,6 +176,7 @@ static int check_is_root(const char *object) out: free(tmp); + free(rp); return ret; }
From: Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com> When "/" is Btrfs, "btrfs property <subcommand> /" regards it as non-root by mistake. check_is_root() regards @object as a file system root if the following two conditions are satisfied. a) Both @object and its parent directory are Btrfs object (file system root, subvolume, inode, and device used for Btrfs). b) fsid of the above mentioned two objects are different. It doesn't work if @object is "/" because, in this case, fsid of "/" and its parent (it's also "/"), are the same. * Test environment Two Btrfs file system (not subvolume) "/" and "/home/sat/mnt". * How to reproduce Submit "btrfs prop get" against the above mentioned file systems. * Test Result ** Actual result (without my patch)